You need to be firm with the school. We had an issue this term and on the surface the school appeared to handle it well. ie: punishment for the bully, reassurance for my son and communication with us. However, having just had a parents meeting, he had had exams and no mention was made of the difficulties he'd had as an explanation of him not doing so well - and they didn't tell us (I heard through the grapevine) that the bullying child had been removed.
Then I find out from someone else, that there had been a 2nd incident in which my boy had been accused of bullying by another boy. Apparantely it was decided by the boys and the staff that it hadn't been bullying but a misunderstanding!! As a result they said they didn't feel I needed to know. Now, I was dead cross, and said that we should have been informed in order to make sure that my son was absolutely clear on what was acceptable and what not.
Maybe I was being a bit sensitive, but I did think it was an odd approach to take. I was mortified that it had even happened and the thought that another boy had felt threatened enough to report it was dreadful. Anyway, we have made our feelings clear and asked that any incident be reported to us no matter how trivial they think it is.
What I'm trying to say in a very long winded way, is don't always believe the school - keep on at them if you're not happy that they have dealt with it sufficiently.
Reassure your daughter - can you get some friends from school round in the holiday for a play, so that she can develop some good support for when she goes back? Tell her it will be sorted, she must be open with you and let you know what's happening, and that she won't get in to trouble for telling you. She's only little and needs to know that daddy can still fix things for her!