Why is she being nice one day and ignoring me the next?

Anonymous
There this girl at work we were getting on great she quite shy and so am I but there were times I flirted with her a bit and joked and she smile and joke back with me etc, however recently she been going very hot and cold, one day she kinda chat to me and stuff but not much then the next day she will act as though I am not there, and being shy myself I don't have courage to try talk to her on days she acts like this, what is going on? did she like me? she hate me now? trouble I feel is its work so feel not a gd idea in general to even pusue this. need some advice
Updates
+1 y
she been doing it as a pattern so I don't think I've upset her
Why is she being nice one day and ignoring me the next?
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