Hmm, now that the New Romney PR's are online, I see that the John Vidgen / Elizabeth Wellden marriage has her down as "Elizabeth Wellden Widow of this Parish Spinster"! One of the witnesses was a Susanna Wellden. Elizabeth's signature says Elizabeth Wellden, so Widow wasn't her surname.
https://search.findmypast.co.uk/reco...%2F0138021%2F1
And just for the record, the mother's name on that 1778 baptism (post #3) is shown as Elizabeth, as the transcription said.