R.J.
you need to find another sitter, this situation is effeting your daughter probably more than you know. first find her a place then inform your sitter that you will be moving her. Talking to her may make it worse. My stepmother and stepgrandmother both ran daycares out of thier houses for years. All the kids were treated the same of course everyone has thier favorites and there are always difficult kids but your daughter should not be singled out and made to stay in areas while the other kids play. It is upsetting to her and I am sure that it weighs on you and it makes her little life not fun. My theory is that kids should have as much fun for as long as they can and if they are in a situation that makes them uncomfortable remove them from the situation. Do her and yourself a favor and get her a new sitter. She will thank you for it