EU re entry after overstay?

It could indeed be that French immigration didn't scan OP's passport when she left France and therefore she got out of the country without trouble, but isn't it possible that her name/dob/passport number may still be in the system as someone who entered France but never left?

In my experience, half of the time they don't scan the passport on entry - often they even don't stamp them, especially when things are busy. You usually notice because they have to bend the passport so that the plastic part fits on the scanner. The scanners don't seem to work very well either, as often it takes two or three tries to get the passport scanned properly.
I.e. I'd be very surprised if not having been scan on entry or exit would create a problem later on.

George5: that still wouldn't reassure me, for what it's worth. Just like there's no guarantee that she'll be refused entry there's no guarantee that she won't have trouble either. Since a lot of money is involved in the wedding, air tickets etc. I would personally feel much better checking with the authorities anyway and change my wedding plans if there is a realistic chance to be turned away at the border, but that's just me.

Maybe it's time for OP to enlighten us a bit here about why she decided to stay illegally, how she got out of France and if she received any warning at that time. Any theory from our side would be mere speculation until we know more about that. And even if OP provides more details, there still won't be anyone who can guarantee her that she will, or won't, have trouble.

The French Consulate can answer this best.

George5. Did you read post #8? Just wondered.

Tony - I don't really want to get into a discussion on this as this is not the place. However : the Schengen system is part of the EU, even though there are member countries that are not members of the EU. The EU is a complicated institution you know !

And there is a common visa policy, which gets decided by the EU Commision. Changes to Schengen rules are made by EU regulations, which are EU laws drawn up by the Comission that come into force directy without any further involvement on the part of member states.
It is the Commission which lobbies foreign countries in regards to their visa policy for EU citizens and it is them who decide things such as the 90/180 day rule and the free-fee-country list for entry into the Schengen countries. The only visas national member states still have regulatory competency for are long term visas add visas for study/work not covered by the Schengen system.

Since the OP has not returned as of yet to even say what actually happened when she left France, everything is speculation at this point.

George5, you've obviously done your homework since #4. That's good because you'll now be aware that there is no "EU immigration", just as there is no hybrid "EU Schengen immigration system".

I'm not bothered that you weren't aware of that and I don't want to get into a discussion about this either. I was just mildly surprised that you hadn't acnowledged my post #8 because I'd taken the trouble to explain the difference between the EU and Schengen.

I'm all too aware of the mechanics of the EU: it used to be my academic specialism. But explaining that is not helpful to the potential tourist coming to Europe. Barely a week goes by without a poster confusing the EU with Schengen when it comes to the 90/180 day rule. It doen't help when people add to that confusion when they could be clarifying the situation.

I'm not bothered that you weren't aware of that and I don't want to get into a discussion about this either. I was just mildly surprised that you hadn't acnowledged my post #8 because I'd taken the trouble to explain the difference between the EU and Schengen.

Oh, I was perfectly aware that not all EU member states are part of the Schengen area. Living in Cyprus, I realize that every time I enter and leave the island for (mainland) Europe. However, as you say that the EU is an academic speciality of yours, I'm a bit surprised that you don't seem to realize that the Schengen system is part of the EU not a separate entity. There is only one common visa policy for all Schengen states an that is set by the EU Commission. In a way it is similar to the eurozone : that is also a part of the EU, although there are both EU countries that don't have the Euro and non-EU countries that do. But maybe we were both just a bit unclear in the wording of our posts....

Forget the Schengen/EU crap. All that will do is confuse the average reader.

The OP may or may not have had her overstay noted when she left France. She has not in fact stated whether that happened or not. For all anyone knows, she overstayed and left without anyone noticing. The OP needs to clarify that point for starters.

IF her overstay was noted, the people she needs to be worried about are French Immigration since that is the country she plans to fly to and that is the Immigration department she has to get past. Not EU immigration or Schengen Immigration, they do not exist.

In your first response george you referred to 'EU Immigration'. There is no such thing and it will as I say only confuse the average reader. It is French Immigration she will have to deal with. Get it right in future and don't bother trying to tell us what is and isn't part of the EU technically. The average reader here doesn't give a toss, they just want to know who will they have to deal with and how to do so.

If the OP wants to know if she will have trouble getting into France, the people to ask are the French Embassy Immigration staff in her home country. End of story.

Interesting to see that OP still hasn't bothered checking her replies. I would have assumed that her original question bothered her pretty much given that her wedding and a lot of money is involved.
The only country OP has to deal with is France. That the immigration policy of that country is in line with/based on EU/Schengen regulations is not important here. The only thing that matters is: will the French let her in? There is no-one here who can give her that guarantee, as said above, also because our educated guesses are partly based on assumptions.