When you actually have to support someone close to you through this
You do know many women here have experienced this themselves, OP? And come to different conclusions to you about what is most helpful to their loved one? And that makes them neither nasty nor 'wetwipes' (wft?)
If your loved one is female, and chooses to present according to male gender patterns, that's OK. Nobody here wishes her harm, nobody wants her to miss out on employment, housing, medical care - and certainly nobody wants her to face violence.
That wanting of basic human rights for all, including females with a cross-sex identification, does not nullify the need for women to be able to speak about themselves as a sex-class.
It is indeed true that women and girls are the only people who can menstruate, because menstruation requires a uterus. It is an insane mangling of biological reality to claim that 'people' do, or even that 'men' do.
How about women, girls and transmen? Surely that's the compromise position? Because anything else is just a big, old, fat lie that requires women and girls to gaslight themselves about the nature of reality. No thanks. Your loved one and their mental health is not the only person to consider here, just as mine isn't, or yours isn't, or the lady next door isn't. It's for us to consider in aggregate - ALL women and ALL girls, and what is best for us as a class.