GIRLS HELP! Why does she avoid me?

Girls, do you ever try to avid the guys you like? I have been trying to get this girl to like me. We've known one another for a while. We weren't exactly "friends". We've been around one another a lot though. anyway...

It seems like the harder I try, the worse things get. Is it possible she likes me, or is she just trying to brush me off and being nice about it?

Example: She will never keep a text conversation going for very long. It's always short messages. And the same goes for things I post on Facebook. It didn't use to be like this at all. Please help me!
GIRLS HELP! Why does she avoid me?
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