Demands on parents from teen

Hi there , can anyone give any advice ?

16 year old teen, capable of doing things for herself however refuses. We have to jump to constant demands , can you get me a drink? can you go and get something from my bedroom,?  can you make me food, get me a charger … complete refusal to do anything. She is sitting A Levels and will not do any work unless we sit with her. We have  obeyed these commands since her diagnosis a couple of years ago for fear of the outlash (aggression) we would receive and now have made a rod for our own backs. We are scared not to comply as we have two other younger children. Any advice on what we can do?

thanks

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