Sorry, can't resist.
Teww hew you wuv hew fowevew and you want to be with hew teww u die!
XD jk.
Just ask her out when she's away from her friends, that's really one of the big things that get girls to say no. They say yes when noone's around, then the next day they get screwed when their friends find out. Btw, this is most of the time.
Edit: DON'T ask her out by texting or on the phone... not really helpful.