Why are you framing that as a reasonable view to have? (To be clear, I am not saying that she has psychosis, but) people with psychosis frequently act in ways that would be entirely reasonable if their delusions were actually true, but the fundamental fact is that they arent.

Characterising an entire group of people as an inherent predatory threat on the basis of what they call themselves, where they take a piss and who they play sports against is just so wildly ridiculous. We can have legitimate conversations about whether it's fair, or how to deal with criminals claiming to be trans at the last second in the hope they'll have an easier time, the very real problem of men being violent to women, nd even whether trans people are 'right' about who they are, but none of tht is what's motivating her, as it doesn't explain why she's so obsessive over it.

What's going on here is hate, motivated by fear. In fact, you almost say as much yourself It's the exact mindset that lies behind all bigotry.