I personally find searching for people in forums alil
stupid..
Why don't you go approach her for her number?
If you're too shy, then ask a friend to help you!!
It's really hard to find a person online, unless you know her name
& class, or even have her pic!
Besides that, she might not be happy that you had opened a thread
asking about her, and that might ruin whatever chance you had in
making friends with her!