Perhaps this is due to the educational mismatch? Meaning she needs appropriate educational stimulation rather than, as you put it KathrynH, mental exertion from more self regulation for paying attention, following the teacher's lead and loss of self directed activities. I know she is having to write a lot more and she tires easily.
Perfect wording! I'd really focus on this, but if the issues all began in March it might be the mental exertion in combination with seasonal allergies. Throw in a growth spurt, which it sounds like her eating habits might suggest, and you could have a storm of issues brewing. There might not be a silver bullet here.
