My daughter is very bright but has terrible handwriting...?

She is 10 years old and does very well in school. However, her spelling and handwriting are awful. I keep bringing it to her attention. I don't know if she's just not trying or if it's just impossible for her. Does anyone have any advice or has anyone had similar circumstances? Thanks.
Update: Thank you all so much. I have received so much encouraging feedback. You people are great!
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