Understand how you must feel. I can tell you that as a teacher, when this happens in a school the staff feel as bad about the situation as you do, it's far from ideal. Be assured that many things are constant for your DD - the lessons, the assemblies, her surroundings etc. It's also good for children to get used to different teachers and their styles, in a way it prepares them for secondary school. I'm sure the school are doing all they can to settle things down but having taught in schools where this happens it shouldn't affect your DD's education. I'd guess she's feeling a bit unsettled but just keep an eye on her and if she seems unhappy, get in contact with the school. You're right to be concerned but don't worry - she'll be fine.