I agree with your definitions, but how much "teaching" at home is reasonable to expect? Is is reasonable to have to reteach just about everything being done in the classroom?
My 5th grade daughter struggles so we help her a lot-- often reteaching much of what is done in school when she is doing homework and studying for tests, sometimes 2-3 hours a night (and have been for 2 years now). Because of this she gets pretty good grades. I have asked now 2x for the school to do an evaluation for LD but they won't because her grades are fine.

We actually have a dx from a private evaluation we had done but they aren't accepting that as showing she needs intervention.
The school has suggested that our "involvement" with her homework and studying is just what any great parent would do and is not abnormal. She has a great teacher so there are not problems with anything in general that the teacher is doing-and the teacher agrees that there are probably some issues going on. I feel like I am homeschooling again, except that I am having to do it after she has already spent 6 hours in school and is tired, frustrated and cranky.
So I have decided that we will only offer "normal" assistance with homework and let her grades truly reflect HER abilities to learn along with her peers, not how well she does with lots of outside assistance. I have no problems with teaching her if that is what she needs, and agree that as a parent her education is my responsibility. But if there are underlying issues that may be helped by some additional resources at school or by having a better understanding of how she learns so we can assist her better then I want the school to look into it. Basically the school has said that she has to fail before they will do anything. I have read the IDEA and ADA laws up one side and down the other and spent hours on wrightslaw.com but can't find anything to really compel them to do an evaluation at this point.
So I am getting an idea of what "normal" parental involvement should be and we will go with that and see how she does.