Can someone please give me a bit of advice about a girl at my work?

ok so i work in a childrens private day nursery and there is this girl there and she is very clever. and when i say clever i dont mean intellectually. she annoys everybody. she waits till people arnt doing anything then asks them to get things for her, and there is no excuse not to coz your doing nothing at that moment. and i dont think she has the best hygiene routine either. i have also known her to be quite rough with the children a lot, especially when they are naughty. but heres the thing. i dont know whether to tell management or not because for 1 she always blames somebody else and it could all come back to me, and 2 management have spoke to her before. please help!