Thank you for your email. I understand your concern for your daughter.
From the information you have given me it appears that your daughter's shaking could be anxiety at having to complete fine motor tasks.
It is essential however that you have your daughter checked out by a professional paediatrician to rule out any physical causes.
If your daughter is in fact shaking because she is feeling stressed and worrying about her fine motor tasks, then it is important to meet with her teacher, the principal of the school and a child psychologist to develop a plan to help her relax and manage the stress she is possibly feeling. It may be necessary for her to have some occupational therapy as well to boost her confidence and give her helpful tools
Initiate conversation with her at home about how she feels about writing her name and drawing and reassure her that you are proud of her and you don't expect her to produce perfect work. Let her express her feelings and offer to help her. Avoid criticising her fine motor work and if she is being self critical explain to her that she is still very young and learning. Part of learning is trying things in different ways and making mistakes.
Continue offering her healthy foods to eat and include omega-3 fish oils in her diet which help with concentration. However, do not make food an issue. In addition, ensure she is sleeping for 10-12 hours a day.
Please let me know how your meeting with the paediatrician goes.
Best wishes