Yes you definitely will not be required to divorce! I'm happy for you both ☺️(You seem like you have your head screwed on) with one proviso: Just be aware If you ever have kids there could be issues with how you raise them..... as you don't believe and she does. Because she will no doubt wish to raise them in. However since you both know each other so well I'm sure you'll work things out.
As to problems post marriage the only issue will be when they take her in for a grilling (which they will). I would definitely advise going with her as her husband and you do the answering because - and I can guarantee this - they will ask her if you consummated your relationship before marriage....
......and how often.
........And what ya did....😳Yup.That's how they roll.
As a believer she will struggle to lie and if she admits what she's done she will be disfellowshipped (not for marriage but for sleeping with each other prior to marriage). If you guys deny this you should be golden. They may take away her pioneer privileges for a bit, but they'll soon be reinstated.
Good luck and best wishes!