My daughter is 5 and has the same issues with writing. Her reaction is different, she tries to quit. We have purchased all sorts of tools to increase her fine motor skill. Things like putty, playdough, beads, and a large drawing/writing board are all supposed to give the fine motor skills a work out. It might give her more confidence when holding the pencil/crayon for drawing.

I also use a highlighter and make the letter/number for her to trace, a little easier to work with to help establish the correct form of the letter. They can track there process with a little less worry over the detail.

Good luck, I know how frutstrating this can be!!!
References :

My daughter was the same way and she just wasn’t ready to learn that stuff yet. I set it aside for about 6 months and then she was much better.

help her master pre-schools skills first sorting, shapes, colors, resighting her address and phone number. If she’s in a pre-school talk to her teacher about helpful activities to do at home. If she’s not in preschool I would suggest signing her up.
References :

maybe the next time you’re teaching her how to write (my 5 year old daughter is the same way-just started school) and she gets frustrated, tell her that you are going to take a break from it until she calms down. this might upset her even more (my daughter has cried) but stick with it. eventually, she will learn to calm herself and focus. my daughter learned that she accomplished more when she was calm and paid attention.

take a walk, read a book, or have a small snack then try to go back and finish the project. this helps alot and gives her the downtime she needs to calm down.

little ones are so ambitious. they want to succeed so bad and it’s frustrating for us parents sometimes b/c we want to help them!!

hope this helps you
References :
mommy of 3