Sometimes she acts like she likes me, and sometimes she doesn't. Does she?

We've always been close friends. Recently I started liking her. She really started acting like she likes me about a week ago. She started texting and snapchatting me from sun up to sun down. She kept making jokes about us having sex, and kept asking me to come over. Now all of a sudden she's ignoring me. I don't remember doing anything to upset her. Does she not like me anymore, or does she like me and she's just playing some mind game or something? What should I do? Should I just wait until she talks to me first?
Sometimes she acts like she likes me, and sometimes she doesn't. Does she?
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