Her emotional state does not effect the concussion but it can slow her recovery. You could try a half day of school but I think she should be trying to do school work at home. If she can get her school work done without it bringing on symptoms, a half day at school may be OK.

I suggest you wait until her head aches are better. The blurry vision needs to be considered as a safety risk. She does not need to trip over books on the hall floor and get another concussion.