A lot of kids have anxiety that is directly tied to the disability. For a period of a couple years DD refused to write in class, at least not more than a few sentences. In her case it wasn't her handwriting, it was an executive functioning issue. She didn't know what to write about or how to get it on the paper. The more people pressured her, the worse the anxiety, until pretty soon she was just refusing to write, in a sort of passive aggressive way.