There can be no accurate data about women and violence if the category "women" has been expanded to include whatever men choose to be included in it. It is like wondering about the average age of dogs if cats are also included in the data. (And you can bet cats would be as awkward as possible about it, because, well, cats.)
If a trans woman suffers violence, that surely should be recorded as a woman suffering violence, in a situation in which self-ID trans women are officially recorded as being women. (Actually, it seems not unless they choose it to be: they are women for some purposes and not for others, which is decidedly confusing and messes up any attempt at getting accurate data about the matter.)
It is also impossible to define "violence" if a woman being gang-raped is put into the same category as a trans woman being addressed or referred to by someone who uses a pronoun for them of which they disapprove, and called violence in the same way.
And when vilifying a woman in disgusting and strongly threatening terms is not defined as hate-speech (though misgendering a trans man or woman is) clearly there will no official record of hate-speech against women.