Was she subtly showing interest when she asked if i had a g/f? what do you think, help please girls!?

I would agree with your suggestion to run into her, but make sure she wasn't getting info on you for her friend. Sometimes we girls ask our friends to talk to the guy and get info for us..so make sure the one you're interested in has interest in you too. You will know that when you "run" into her at the mall probably.