i wouldn't tell her. i don't tell my new friends i'm trans because there's honestly no point. we aren't gonna have sex, etc. if she found out from like say, my cousin in that situation, i'd be like "yeah, and?" because it honestly isn't something that SHOULD matter or SHOULD effect how she is your friend. i mean, i guess people do it because they don't want any surprises for their new friends like someone slipping up, etc. and they feel it's an intimate detail they share about themselves when their friend shares details about themselves but i'm like eh, it's whatever. i've had surgery, name change, hormones, etc. i'm just a regular guy and unless you're a doctor or i'm sleeping with you, there's no reason you need to know. if they found out from a third party, oh well. i wasn't hiding it, i just didn't care to tell them. if they were hurt feeling like i couldn't or they weren't important enough or whatever, i'd just explain that it isn't something i broadcast because i wana just live my life and unless we are gonna sleep together, it's no ones business imo and i'd be sorry that they felt hurt, but it is my choice to disclose things, just like it is their choice to disclose things.