What about preparing directions that are pictures with simple words underneath? Give the class directions and then take her separately and give her a modified lesson using picture directions. Yes, it is more work for you, but many things will happen...#1. She will have some direction and understand the expectations. #2. You will be helping to develop her communication skills. #3. She will gain a sense of self-worth by being able to check the directions herself and do her lesson.
Is this extra on top of everything else you have to do...absolutely!
I am having similar problems because they have decided that Art is a good place to do OT...so now using "directed drawing" some of my special ed students are doing work they could not do on thier own. IT is causing problems because the work being produced is NOT the work of the student. So.....I am going to have to say something about this...to the OT and to the SPED staff....I was against this...but decided to see how it would work...I can see although we use the same materials (writing/drawing materials, cutting, etc....OT is not ART) So there you go!