improvement of writing skills

Is she having trouble forming letters or just not writing clearly enough?

For letter formation, practicing on tactile letters can help or writing letters in a plate of sand, flour or rice.

For just better handwriting in general, some simple handwriting workbooks could help or copying passages in favorite books.

Stretching out the hands to get the fingers "sensitized" prior to writing helps some kids.

She is still young and some children just need extra time with handwriting as their fine motor coordination is still improving. Good luck!