@raynbow- The problem that your friend is having is most likely a lasting effect from a serious sprain. Being inactive for a while as a result of her hand and wrist sprain no doubt has contributed to her feeling as if her hand is still in pain and not as mobile as it use to be, even though her doctor has told her she has healed.
The best thing that your friend can do is to talk to her doctor about her problem, and ask if physical therapy will help her hand feel normal again. In therapy, she will be shown how to do various exercises that will stretch the tendons and muscles in her hand and wrist. These exercises will help her regain more movement and flexibility in her hand, which will also alleviate some of the pain that she is experiencing.
Her therapist may also use a combination of heat, cold, and ultrasound therapy to help stimulate the muscles and tendons in her hand to help them get back to normal. In addition, your friend may also be given instructions on how to do various hand exercises at home to keep her flexible in between her therapy appointments.