Since the teacher asked you for suggestions, I'd say you have a chance to make the day better for your DD, if not as challenging as she needs it to be. Some things that might work or have worked for my kids in the past:
- instead of practice writing letters or her name, work on writing color or shape or other sight words, or - if she is ready for even more - have her write short sentences, working up to several short sentences. This should take no longer, really, than the other kids' writing practice.
- send in a few books that are at your DD's reading level that would be just for her or that you could donate to the classroom
- donate to the classroom some individual creative thinking games, like tangrams or Rush Hour that she could play with during free time, or encourage her to build with blocks or legos.
- encourage open-ended art projects (not prescribed craft projects) using many various art materials
- encourage the teacher to get a larger range of puzzles or, again, send in or donate puzzles at your DD's level. Even if other kids aren't ready for the bigger puzzles, they could work together on them or just work on sections of them.
I think it's great that your teacher is at least asking if there is anything more she can be doing. We have found a varying degree of willingness to adjust what happens in the classroom and in pre-K, especially if it in not mandatory schooling, teachers sometimes feel no obligation to offer more or different for one child. But we have found some success with activities that our child could do at the same time as the other kids doing their activities, just at a higher level, so it doesn't interrupt the classroom schedule.
Hope it starts to go better for your DD!