Most Helpful Girl
Tell her when you feel it is the correct moment, don't rush it.
Most Helpful Guy
Well when my ex told me about hers she actually started talking about the way her mother treated her brothers potential mental health issues and I chimed in with a supportive sounding reaction then she opened up to me about her therapists and medication. I was shocked at first cause we'd been dating off and on for nearly four years and she had never mentioned it but because we had just talked about it it fealt a little easier to accept. So I guess why not try talking about it in general or about the potential for a family member to have one and listen for her reaction. If you feel comfortable share if not wait a little and talk some more.