S.A.
I have not experienced this, but here is my opinion. She should at least send an invite to dad( and his wife), and leave it up to him whether he shows up or not. However, please discuss with her both senarios...if he does decide to come or if he decides not to come. I just say send invite, therefore she won't have any bad "what if" feelings. That way she will know that she did the right thing and left the rest up to dad.