Girls, hi! Can you please tell me, I don't know, maybe I'm worrying fo…

Girls, hi! Can you please tell me, I don't know, maybe I'm worrying for nothing ? My daughter is 4 years old, we go to kindergarten everything is fine.. But lately she's been very aggressive, cries without reason, sometimes it's because of a trifle, she can get hysterical.. Sometimes she asks what color, may say there is no such color, or not answer. We went to a neurologist, psychologist They say everything is fine, don't worry, the child has such character... I don't know what to do?!??