Just say 'hi' when you see her and just act normal and if you like her that much then go for it, I;m and 12 year old girl myself!!
How to impress this 12 year old girl that i love?what should i do to earn her love?
Hang with her be a funny friend it will work and get you a girlfriend trust me "I'm 13
I don't even think this 12 year year old has even started puberty, she isn't even mature yet, falling in love with her is a wrong idea.