Thanks for the suggestions. We will certainly give them a try.
Jesse - from what I can gather, her frustration comes from a) her brain working way faster than her hand, and b) her perfectionism is too much to cope with (she can't tolerate making letters imperfectly). She has ADHD as well, so there could be many reasons for her to be frustrated.
She tends to get into really negative cycles where no amount of coaxing and bribing can convince her to cooperate and she seems to be in one right now. She wanted to learn handwriting this summer and barely made it through three letters before throwing the book down in disgust because her letters didn't turn out well enough.
She has a follow-up appt with her psychologist this week as a prelude to the school year. She wanted to work with her on self-talk and coping skills to deal with her frustrations at school. I will certainly mention the printing issue and see if she has some ideas.