Big Girl Problem!!!!!?

Right, i'm thirteen and fancy this 14 year old in year 10, one of my best friends blabbed to one of his friends, who is the girls best guy mate and he told her, he said it to 4 people and they like walk past in the corridor and like take the mick, i got really annoyed with my best mate and they always come looking for me. So there she is and she walks past on her own and his two friends go 'say hi' so i do and she says hi back. She must think i look like a total weirdo but shes still nice to me on msn. What do you think she thinks?