hi @ellatalley31 it's great your daughter is talking to you about her feelings. Please be cautious with any assumptions that she may be trans because she fancies girls. Children are now taught that gender is an innate identity (like a soul) that can be born in the wrong body. Most girls who think the are ftm actually are just lesbians and realise this after puberty and in an environment that is accepting of homosexuality.
And there's nothing wrong with being a lesbian! Butch lesbians, feminine lesbians and anything in between. There is no such thing as 'feeling like a woman', especially as a teenager, unless she has diagnosable body disphoria. It's normal for girls to feel very uncomfortable going through puberty and discovering the unwanted attention of males. There has been a huge increase in referrals to the Tavistock due to teenage girls thinking that if they fancy girls they must be trans.
If you'd like more information on some of the issues around this and the importance of waiting and seeing how your daughter feels in a few months and years' time, please read this article from a Tavistock psychiatrist: quillette.com/2020/01/17/why-i-resigned-from-tavistock-trans-identified-children-need-therapy-not-just-affirmation-and-drugs/
Being trans is becoming very popular with teenagers and yet it should be entered into with great care. Hormonal treatment can cause infertility and permanent physical changes. There are currently no clinical trials on its safety.
There is masses of information on this site for parents with trans children, looking especially at the huge increase in teenages declaring they are trans and the influences around this: www.transgendertrend.com/
Please also speak to your daughter about her internet usage. There are forums on reddit where adults adopt trans children and this is a safeguarding risk. You can find a lot more information on the male-driven trans movement on the Feminism board of Mumsnet.
May also be worth asking the school if they are a Stonewall or Mermaids champion as they push trans ideology onto children instead of discussing what it means to be gay or lesbian.
Hope you and your daughter are doing well.