I feel when you got an ex-parte divorce decree, that means if she has a genuie allegations she would have definately come to the court and opposed the trail Right.
I feel you should see what's her allegations on record which she can prove in the court of law Right.
If you feel these are vague and immaterial allegations, better is to go ahead and get remarried, because there is no bar to it.
But ensure that she should not move an application for setting aside the ex-parte decree or file an appeal .
Kapil Chandna Advocate