Thank you for the insights, I will have to read all those threads tomorrow Locounu!
I should have said DD#1 (9yrs) definitely has LDs at play and probably ADHD, possibly mild ASD issues. It's all still being investigated. She's come a long way in the last two years though. The two girls are intense in different ways but DD9yrs is the more intense one in many ways. DD#2 is the middle child, the easy child, and would have been TOTALLY overlooked had we not taken her to the OT to make sure we hadn't missed sensory issues in her too. It was the OT who recommended the ed psych eval...
Locounu I don't think DD#2 is being at competitive with her older sister. I think she's bored and she likes her sister (who is probably the best friend she has at the moment), so wants to be with her, and her sister's friends who she also likes, and thinks their class might be more interesting than the one she's in at the moment (and she's probably right there!). According to the SB5 manual I just read, her "mental age" would be about the right for grade 3/4. Academically she is absolutely not ready for a 4 yr grade skip (yet) and even if she were, it's not going to happen :-). But the one year skip she has coming probably isn't going to help much.