A bunch of friends and I [3 guys 4 girls] went out to the bar...this 10 shows up late and introduces herself to me. She asked what my name was and started asking me some questions...After I told her my name, she asked for my last name. Then she asked me if I knew her friend and if I knew everyone there. She also asked where I went to school and what year I graduated. It was like she was interviewing me and didn't really give me a chance to talk. I feel like she was testing me to see if I could come up with something interesting to say.

I wasn't really feeling well tonight so I just made small talk and wasn't trying to pua. Also, I don't have much experience with 10's so I didn't even try really. After she was done, she went and sat by her friend and ignored me for the rest of the night.

Was she even into me? What should I have done?

This is what you should have not done.

What should you have done? You should have taken the lead.
Forgive me for sounding misogynistic, but she was essentially handing you her leash that was attached to her collar wrapped tightly around her neck. When you refused to take the leash, she regretted ever feeling attraction for a boy who she thought was a man.

Go with RSD's standard move for when a girl opens you: CLAW and SOI

ok, she opened you, created comfort and u chose small talk?

KINO!!! DHV (only a little, u already have huge value thanks to her coming to you)

When she asked if u knew every1, hell, she is allowing u to show social poof!!

sorry, i dont know where to start. but, but..... ah just forget it