Yeah, for your own peace of mind, it would be good to keep interactions/contact with her away from the internet, where it can be seen by everyone. Honestly, I don't understand what's so hard about calling a girl by her girl name, and referring to her as a girl... It doesn't take being a rocket scientist to make the switch IF you're willing. Obviously, she's doing it on purpose. If she wasn't doing it to be malicious, she'd at least correct herself when realizing it, or shy away from using any pronouns with you at all.
:S
Hugs hugs hugs