I was thinking that this was a Alien Space Bat.
Then I notice when my Teenage Daughter came home that she is reading the book Speak by Laurie Halse Anderson.
That gave me a idea.
So what if we have a plot where in the last season 16 year old Punky is excited that she has a Boyfriend.
Then at the beginning of one of the episodes, she comes running into the house and slams her bedroom and lock it.
She has a change of behavior and is isolated from her friends.
The Episode ends with her Father discovering that she is trying to cut her wrists and kill her self at the end of the episode.
The next episode, she is talking to a Psychologist and the episode is just the two talking.
The Doctor is trying to discover why she attempted to kill her self.
At the end of the episode, it is reveled that her Boyfriend, try to pressure her in to having sex, and when she refuses, that he raped her.
This would be shocking for a sitcom in the 1980's that was considered silly show.
We could have the rest of the season, her dealing with her feelings and end the series end with her going on her first date since she was raped,