I have a 2.5 year old so different issues. He loved it when i started minding, says his friends are coming to play but when we got busier - i have an assistant and 5/6 kids each day, he started to struggle, gets jealous has tantrums gets really clingy, whines and says wants them all to go home.
During the day i make sure i get him to myself for a couple of minutes as often as possible - easier with an assistant but also when other kids are asleep, give him little treats, toy cars or choc buttons or something and sit him on my knee and make a big fuss of him. After the kids leave for the day he always gets a treat, ice lolly or something nice. I ask him to help during the day - fetching baby wipes handing out drinks etc and call him my helper. its paying off and he is geting much better, i found the more i told him off the worse he got so i almost ignored the bad behaviour and gave him lots of love and bribery!! not sure how helpful this willl be as your daughter is older but i do feel your pain, good luck, i have spoken to other childminders and they all seem to go through this but it always seems temporary and she will accept it, do you mind any the same age as your daughter or can you so its more of a friend to her than a mindee?