P.R.
Maybe it is just a simple case of being too emotionally imature, misses her sister who is close to her own age. Our son regressed in the first 3 grades, finally couldn't even add 3 and 1 at the board, in the 3rd grade, froze! he had headches, stomach aches, then lost patches of his hair, so held him back in the 3rd grade, then he blossomed, but was always shy, but gradually overcame it as his self confidence grew. He was 5 years old , 6 in Nove. 27, when we started him, nothing takes the place of immaturity, and can be a problem the rest of his life, if not noticed early--not impossible to correct, it just complicates a normal, trait in a sweet child! PR