The girl i likes getting trashed, how do i help her and show her i care?

ok so she has a formspring and some guy is leaving anonomus sexual messages. the guy is trying to make her guess who he is and he's being perverted about. (extremly). i've been posting jokes to make her feel better and telling off the perv anonymusly. i want to tell her i'm the one leaving the good responses and that i like her, but i don't have any classes with her and we haven't talked in 2 months? how should i approach this?