What you do when your female friend starts flirting with you for no reason?

Ask her what is up? Talk to her if you don’t want it to be more than friends.

go for it. My best friend from HS, who is still one of my closest friends and smoking hot, told me that when we were both around 19, she wanted me really really bad and I was too stupid to see the signs. Big regret!
Take the opportunity when you can.

decide : if she's interesting then ignore cuz you value her friendship

I normally change of topic but sometimes I play along and they get scared.

I wouldn't know how to recognise it if she did.

[c=#BF0080]I'd feel bad for the girl. [/c]

i whip it out lol

Ive had a female friend for 15+ years we are great friends, but now im transitioning she has started flirting and asking me about my thoughts on 2 girls being together. Ive no problem wiv that but she knows my gf well?

Flirt back

you're imagining it and probably reading too much into it.