I don't know OP and obviously I'm not privy to the conversations which have gone on.
However, those on the side of the gender ideology perspective tend to have an all or nothing approach. Many, many women have been denounced as fascist bigots for refusing to believe that people can magically change sex, and for wanting boundaries around women's single sex spaces.
Compromising or agreeing to disagree is often not sufficient. The movement has done a very good job of convincing many young people that women who believe in sex-based rights are bigots who deserve to be ostracised. Even if it's their parents or close female relatives.
OP isn't the first woman to come onto MN and say that she's been cut off by her children because she refused to change her views on sex-based rights for women.
We don't know what happened here but those who believe in gender ideology often have an ideological fervour, and anything other than complete agreement means you're a right wing Nazi in their view. Up until the release of the Cass report, their mantra was #No Debate - which pretty much says it all.
If things played out with the OP and her DD as has been seen widely elsewhere, there's probably little OP could have done to persuade her DD that they could agree to disagree.
I don't want to derail the thread into a whole conversation about gender ideology but I don't think equating women's rights with homophobia or racism is helpful. With the Cass Report, the ban on puberty blockers, and today's announcement that the new NHS charter means trans women won't be allowed onto single sex wards, there seems to be a gradual awakening to the fact that women fighting for their rights to be identified via their sex had a valid point all along. So the answer to the point about where all this is leading is that maybe we're heading back to science-based facts, and where we originally started from!
I don't need to fall out with any family member over my views, but equally I don't think it's healthy or helpful to pretend to believe something that you don't. I have a couple of elderly family members who are racist, homophobic, and xenophobic based on historic attitudes that were prevalent in society during their lifetime, and while we always disagree, we have had many conversations where I've challenged them respectfully to prove their point/defend their views.
The issue with gender ideology is is that certain parties have brainwashed sections of society, particularly younger people, into believing that championing/protecting sex-based rights automatically makes you an evil person and that only complete agreement will suffice. And that's why gender ideology is so problematic and cult-like. And why it ends up in NC/low contact and charity shop presents.