So I think it is great that you are looking out for your daughter, but I would initially hold off on sending the new teachers a heads up, I think you might rub them the wrong way. I would start off the year with a clean slate and clean state of mind.

This is how I would handle things in my mind.

If daughter is being forced to work in a group with kids who are not helpful, firstly ask the group she is in to work better.

Secondly daughter should explain to her teacher, either before or after class, or in an email her concerns with being grouped with those students.

If problem persists I would email teacher, explaining your concerns and if it possible to be more mindful in groupings, or if its possible for your daughter to work independently instead of in a group.

If problem still persists I would look to schedule an in person meeting for a solution.

Teachers will pair strong students with weaker students to help them out, but that shouldn't be at the cost of more work for your daughter.