Usually its not finding questions to find, but a common interest that the two of you have. Maybe something like cooking (as an example). You can talk about recipies and advice. Current events are always hot topics. If she is married you can ask about that like, how did he propose, how long were you dating, how did you meet? Sometimes it takes some time just to be comfortable enough around each other to have longer conversations. It took me almost a year to be able to hold a conversation with my fiance's mother when I first started dating him. I didn't know what to say, but now we joke and laugh. It just takes some time and comfort levels. Like I said try to find some common intrests and start asking questions about those.