Actually, the director at my school did tell me that there was a play that was a follow up to The Miracle Worker. He said that it is called Tuesday afther the miracle and it is about Helen's later years with Anne Sullivan while she is at college. And, the two actually fight over a guy.
"If you try to shag my husband while I am still alive, I will shove the art of motorcycle maintenance up your rancid little Cu**. That's a good dear"
Tom Stoppard's Rock N Roll