Dear Mary，
Are you better now? We are very concern about you. When we heard you hurt in a car accident, we were sad and some of the girls were full of tears. But luckily you were not badly hurt.
We will go and see you after school and please don"t be nervous and worry about you study. We will help you with your lessons. You"d better follow the doctors advice so that you will be better soon.
Yours，