What can she do? Set up some independent projects, 15-20 minutes worth at a time, that she can do to enhance her strengths.
What are her relative weaknesses? Set up some activities to give her extra practice.
She can work on these while everyone else is finishing the assigned task.
Does she really need to do what the other kids are doing? If she's already mastered it, don't make her do it at all; jump right to the "extras."