Girl is sarcastic But don't know if she likes me?

This girl in school was interested in me at the beginning of school and definitely liked me and Now that we are finally talking she's Shows all signs of sarcastically flirting and on this's after school app she posted "when you are a sarcastic little shit to your best friend" and She ask me personal questions and told me that she was single And made jokes to find out I was single and I can sometimes catch her looking at me and she says she does this annoyingly sarcastic stuff only to me like saying I'm annoying And I hate you stuff but she's Says it while laughing sarcastically but don't know if she likes me since she won't reply me back when I message her and stuff outside of school and she Called me best friend too so I don't know If I'm just a close friend
Girl is sarcastic But don't know if she likes me?
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