Hi Sally
Oh, how sad ... she was just 17 years old.

Obviously her marriage record would be the best source of information, but as she was a minor when she wed, the Intention to Marry notice may give you some clues.
You can request a look-up of the notice (ITM) [please see the notes in the Resources section of this board, on how to proceed with this.]
The ITM would tell "how long she had been resident in the district in which she was to marry" ... and hopefully give the name of the person giving her permission to marry.
~ Lu