I would probably look first to executive functions and even motivation. Does her handwriting bother her, or interfere with her legibility to herself or others?
aeh - Yes, DD9 has ADHD, inattentive type. So that could keep her from writing well, spelling well, and writing legibly at the same time. Interesting. Her focus is on the thoughts coming out, not the less important (to her) items. I asked her today if she could read her own handwriting. She was rather put out with me for asking! Evidently she can read the scribbles, tiny as they are. Her teachers have trouble though - she gets smiley faces, praise, and thanks when she writes neatly!! I push her to do her homework on the computer, with the teacher's permission. I feel bad for her pre algebra teacher because the problems she writes out are horribly messy. I don't know how he knows what is going on. Someone mentioned here to use graph paper for the math. I might try that.
