Note that I'm not necessarily opposed to her facing consequences for killing him -- my issue is with how gleefully NYPost is framing it as if she just attacked him out of the blue and shoehorning her into the "evil transgenders" stereotype
Yes, as the armed person you do not have any claim of self defense against an unarmed person.
This is absolutely false. Arming yourself does not prevent you from making a claim of self defense against an unarmed attacker. "Being armed" does not negate your claim.