I cannot tell if she likes me or not?

Okay i am in the 8th grade, close to 9th, and at school during gym this one girl whos one of those popular girls but not snooty about it, she came up to me and asked me what my name was. I answered and she said cool then walked away. Then later a basketball almost hit me and she kinda screamed and said are you okay after. Then, about 2 1/2 weeks later, near valentines, she sends me a message on Facebook saying "Hi :)" with a pic of a stuffed bear next to it. I sent a mage back saying hi and she has not answered back yet. Can you tell if she likes me?