The why she became a therapist question is a good one.
Possible ideas:
What's the favorite place she's visited and/or lived in?
Embarrassing moment? (will help to humanize her!)
What she would do if she had a totally free Saturday and could do anything she wanted.
What would be the first thing (not a person or pet) she'd grab from her house if there was a fire?
What would she do as a career if she weren't a therapist?