Nothing to do at work?

We are busy but my coworkers are hogging all the work and dont like it when I help them do research for their projects. It's a retail job. It's literally just one coworker I think is causing this because when she went on vacation it was very peaceful. She thinks that im going to take her old position or do better than her.

I forcefully got promoted to the same job as her and some others and she still treats me like im under her. I was taught the same things she does but she wants me to do the small things because "she has to do the big tasks" even though there are several other coworkers there that can do it and the manager doesn't tell her. She hogs all the work and gets it done so that i dont have anything to do. When im off work she just stands around talk and works SLOWLY and takes all day to do one thing. Not only that but she likes to act like a manager and loves to catch me standing (even for one second ) around so she can ask me "what am i working on" while not doing anything to others.

Every morning they schedule me with her but she gets there 30 mins before me. She hurries up and does everything quickly so that i dont have anything to do while she will find one small thing to do (that she takes the whole day doing) while i dont have anything. Which means i won't have nothing or much to do and she comes up to me to ask what am i working on. Regardless i try to look busy to avoid her but she still comes up to me. Every manager we have she has to be under she/he butt and have them wrapped around her finger. The current manager we have used to be close to her but i dont know how they are. She even tries to tell him what to do. I dread coming into work every day because of her. Advice?

Nothing to do at work?
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