If you are seeking services from the school, don't specify "an OT evaluation"-- write them a letter where you lay out all the specific difficulties and ask them to evaluate her in all of these areas. This casts the widest net and gets you more thorough testing.

Many schools do not recognize the term "dysgraphia"-- you might mention instead that you suspect a "disorder of written expression" and give them examples of tasks she struggles with.

Best,
DeeDee