Im in fifth grade and I really like this girl how do I know if she like me back?

im in 5th grade too! wait, you dont live in oregon right?
anyway,
she will often take glances at you, then when you look at her she'll look quickly away.
if she's near her friends and they start giggling and smiling when they see you she has probably told her friends her crush.
she will try to approach/talk to you but might often walk away.
when she's near you she will say stupid things and try to make you laugh.
good luck hope this helps!!