I think she's fantastic. She overcame depression and a difficult time of raising her child as a single mother to become a world famous author and billionaire to boot. She founded and contributed to numerous charities, and actually pays her taxes.
I do think that she could have done with being a bit more careful when expanding the lore of her works in regards to naming, etc, but I see that as more of a clumsy attempt to be more inclusive (and she can be a bit sloppy with details in her work overall).
As for the 'trans' stuff - I don't see what she's said that's problematic. Women menstruate. Men don't. She supports trans people's rights to live as they want, and their freedom from discrimination, but not if that involves discriminating against women by ignoring basic scientific fact.
You can get women who don't menstruate, but that's because of biological reasons (medical conditions, age).
Some transmen can menstruate because they're biologically female.
Some transwomen can't menstruate because they're biologically men.
The fact there are some people who feel that they fit outside of our binary biology doesn't alter the fact that we, as a species, do have a binary sex system. Yes, there are variations within that, but it's a tiny fraction of our species as a whole.
It's like saying that humans aren't bipeds, that we as species don't have two arms and two legs, because sometimes babies are born missing limbs, or people have amputations.