My 15 year old DD (I'll refer to her as "Betty", which is not her real name) came out to us about a year ago and has so far only had one (very short-lived, not at all serious) girlfriend. She is really, really keen to start dating someone properly, but struggles to meet other, similar aged lesbians in our area. She is "out" at school and goes to an LGBTQ+ Youth Group and a Theatre School at the weekend, and through these, she has met someone called "Miki" (not their real name).
When they first met, Betty says she thought that Miki identified as non-binary, which she felt comfortable with, as Miki was assigned female at birth and appears quite feminine, despite using they/them pronouns, having a 'boy's haircut' and wearing gender neutral clothing.
Betty and Miki have recently started dating, but Betty has just found out that Miki actually identifies as male/non-binary and does not identify as female at all. This has left Betty feeling very confused, because as a lesbian, she is physically attracted to Miki, but as they don't identify as a girl, Betty doesn't feel that it would be right to date them.
Betty has pretty much decided that there is no future in this relationship for herself and Miki, but with such a small LGBTQ+ community for their age where we live (and the fact that Miki is a lovely person!), Betty is really keen to remain good friends with them. She obviously needs to explain to Miki that she is gay and is only interested in dating girls, and as much as she likes Miki, the fact that they identify as male/non-binary, means that they are not a suitable person for her to be dating.
I'm looking for advice (possibly from someone who is the Mum of someone AFAB who identifies as male/non-binary), so I can help Betty to explain things to Miki without them feeling like they need to change their gender identity so Betty will continue to date them, or being horribly upset or offended by Betty saying the 'wrong thing'.
It just feels like such a minefield, I'm hugely aware of how fragile the mental health of LGBTQ+ teens can be and I desperately want to avoid Betty upsetting Miki, and Betty becoming increasingly stressed and worried about the situation. She's questioning if how she's feeling will make her sound transphobic and she's unsure if it's even ok for her to feel this way about Miki's gender identity (I have obviously reassured her that it's fine to feel however she feels), or if it's disrespectful. Betty has asked for my advice and I really don't want to get it wrong.