what do you do when your scared of your case worker

hi. im my daughters nominated carer and mother. She is 21and recently put under the mental health act and medically hospitalised. She was released from hospital and was told she had to sign the management plan which entailed she had to keep seeing her outreach mental health team or they would send her to a mental health unit. The trouble is she is happy to do that as long as she has a change in her case worker as she is terrified of her. I tried to talk to the case worker and asked her if there was something she could change in her aproach but she told me it was my daughters brain that was the problem. I pointed out that my daughter was able to form postive relationships with other people except her and she told me that she was the best person there and everyone agreed. She also told me that I dont care for my daughter only she did. I feel this case worker has a lot of power and could easily send my daughter back into hospital just because she doesnt like her. We havnt heard from the mental health outreach team since the phone call which is quite concerning. I'm not sure who I can talk to as I feel that they just think I am the trouble and will try and stop me in supporting my daughter. This relationship she has with the case worker is not a positive one and is inhibiting her recovery. She has requested a change in writing and verbally but has not heard anything. She is concerned that as they are only hearing or listening to the case worker her concerns and my own are not being taken into account. I am not aware of who I could talk to about the case workers behaviour and even if I did say anything would I be listened to or even make things worse for my daughter.