Let go gradually. Allow your child to go to MDA summer camp or take other short excursions. Let her plan and arrange public transportation across town, then perhaps take a part-time job. Encourage your teen-ager to pursue what he likes and does well. That helps develop a winning attitude, not one focused on his disability.
Adolescents can practice problem-solving, and they'll learn from experience what their limits are.
Respect her privacy. Respect your youngster's choices about what information to share with you, and her need for time with close friends. Build your own support system. MDA has support groups for parents, where you can express your concerns and get advice from those who've walked in your shoes. Your situation is unusual, and you may need to seek help from adolescent medicine specialists or other professionals.