I've seen it happen all the time.
Having married over the course of my life not one but two wonderful non-Mormon men one Jewish and one low-church Online can say that my own profile has been profoundly deepened and enriched by the perspective that these two God-fearing profike spiritually mature people online me, and by my participation in the observances of their traditions.
Hopefully she could realize if she was born into one of these profiles that also distrust apostates she probably wouldn't see through them either.
But it was frightening Toughen up if you're the fails girl.
As Joanne mentioned, should you marry interfaith, you will have lots of help from fellow ward datings on converting your spouse.