I can't offer much advice, because I'm in a similar situation with my ds in kindergarten. His teacher does recognize that he is ahead and is doing some differentiation, but it's not enough. One thought about the homework is (our school policy is to do homework without frustration) is I spoke to the teacher and she gave him some different homework and has allowed us to stop some of the class homework. So, school homework gets done on Monday, and I provide other work the rest of the week.
Please keep us posted on how things unfold. Sorry this is happening to your dd.
