I Am An Attendant Care Person With Dandy Walker Disease

I am an attendant care person with dandy walker disease her behavior lately has gotten out of hand especially when she doesn't get her own way she throws things breaks things Quantech just anybody around her by pulling her hair and biting them especially does this to the ones that are around her a lot which is her mother and her aunt become very bossy very controlling and if you don't do what she says or ask you to do she gets way out of hand I want to try to help her mother with disciplining her because she has antiworker disease I'm not sure how the discipline should go because she's not a normal child could you help me with this or give me some sources to go to on disciplining a child with Dandy Walker syndrome