Welch returned for a guest appearance in 1976 when Maggie 's trial was shown .
Welch appeared in the show 's final episode in 1977 where it was explained that Maggie had been released from prison .
Welch returned for a guest appearance in 1976 when Maggie 's trial was shown , and she appeared in the show 's final episode in 1977 where it was explained that Maggie had been released from prison .