Daughter coming out.

Not sure where to ask this question But I’ve recently found out that my daughter has a gf. I’m fine with this but I feel she’s worried to tell me. Should I approach the subject or wait until she’s ready to tell me? None of us are big talkers but I thought she would be able to tell me.she’s at uni so don’t see her often . If she does tell me what should I say without getting things wrong. She mentioned years ago she wasn’t sure if she felt was a boy or girl and this was after days of acting weird and I was worried something had happened or she was Ill or pregnant so when she did tell me I was thankful it wasn’t anything like that and played it down but that got her angry and said I’d made her feel like what she was going through didn’t matter but I was trying to say it’s fine. I really don’t want to get this wrong. Any advice ?