If she was refusing to accept a medical diagnosis, then you did the right thing. Just to note, though, my DS has the same issue and he CAN get lazy. The school needs to make accommodations but I also told them if it looks like he's not trying or he gets excessively sloppy, they should push him a bit. In other words, make accommodations, but there also needs to be some expectations based on what we know he CAN do when he tries. I'm not saying that is going on with your DS (for all I know he always does his best), but it's possible for there to be a gray area, where the child has a disability, but also isn't putting in the required effort. If he was doing his best, but she was keeping him from fun activities, obviously that is wrong and you need to stand up for him.