She started avoiding me all of a sudden?

she was pretty interested then couple days later she avoided me and looked at her phone. next day, we were walking towards each other and i was about to make a move on her, but she ignored my existence again and didn't look at me while her friend was staring at me.

So i decided to let her go and ignore her back. She saw me with my female friends and got jealous, i ignored her back just like she did to me. After that she started looking at me all the time and i continiued to ignore her. Now she looks sad but still tries to get my attention.

What is she trying to do? Why she acted like that when she was pretty into me before?

She started avoiding me all of a sudden?
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