Daughter keeps telling helper she doesn’t like her

Firstly, I agree with some of the others, to acknowledge that your child has an emotional response to your helper. "I see you're upset with <helpers name> and would rather she not look after you. Secondly, say that you'd like to help her out with her feelings, and that there are appropriate ways to express her feelings and work things out. But telling someone they don't like them and slamming the doors is not an effective or appropriate way to do so. When you explore her feelings - the causes could range from something the helper has done that can or should be changed, to the child feeling upset about something completely different but projecting it onto the helper... It may be something you can't "solve" like maybe she misses the previous helper and wishes she were back - but you can help her see that its ok to be sad, and do something like write her a letter, but that being angry at the new helper won't help. And going back to the way she has been behaving, reinforce that it is not appropriate behavior - and that next time she's that angry or upset, give her alternative things she can say or do - like I'm very upset right now, hitting a pillow... And if she does it again, she will have to face immediate consequences (time out corner, reduced privileges - whatever you usually do).