@Green Witch,
It probably is. You should write that story. There are short stories, even novels, that are either based on famous characters like Gertrude and Miss Havisham. My daughter gave me a what she described as a "semi-literate" book called
Ahab's Wife. The book started off alright, when the writer was more or less sticking to Melville, but, as it went on, there were just too many co-incidences (the title wife seemed to meet everyone who was famous in the 19th Century!) and the personality of the wife did not seem like someone Ahab would have married. Oh, she was a plucky (the only word for her) girl who went to sea disguised as a boy and she had her own haunting incident but she was also over-sexed and a tad silly.
Look how many books borrow the plot of
Jane Eyre or extend it:
Rebecca,
The Secret Garden and
Wide Sargasso Sea. Those books are all as popular as Bronte's original.
Go ahead! You will have a blast.