I see there's a few of the "be kind" brigade in the voting. They're part of the group that helped this shit show get to where it is.
Just use she even if they're a man, it's kind and it costs you nothing.
Of course they're a woman, you wouldn't be referring to them as she if they weren't.
Of course they're female, everyone refers to them as a woman and uses she when talking about them.
Of course you can't exclude them from female spaces, services, prisons and sports, they're female.
Being kind doesn't "cost us nothing."
It's cost us everything.