Why can't I ever make my manager happy?

Okay, so I work retail while going to school to be a teacher. I got hired 5 months ago and everything was really good and my manager was always very nice to me. However, for the last month, no matter what I do , she's mad at me for something. I've gone in on my days off to help her, I've stayed past my... show more Okay, so I work retail while going to school to be a teacher. I got hired 5 months ago and everything was really good and my manager was always very nice to me. However, for the last month, no matter what I do , she's mad at me for something. I've gone in on my days off to help her, I've stayed past my shifts to help her, I never call in sick, I'm responsible, I work well when I'm at work and everyone really likes me especially the customers...and yet my manager still complains ...I don't understand what I'm doing wrong ...can someone explain?
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