Hi,
I've found these obituaries which fit the burial you have and the 1891 address,
Newcastle Evening Chronicle 07 October 1896
Walker - WELCH 15 Somerset Terrace, 5th inst. Isabella wife of the late Robert WELCH. Internment Walker Churchyard, Thursday 3.15pm.
Shields Daily News 08 October 1896
WELCH - At 15 Somerset Terrace, Walker on the 5th inst. Isabella wife of the late Robert WELCH
Do you think she could have been registered as Elizabeth, or a mistake made?
Elizabeth WELCH Dec Q 1896 Tynemouth 10b 145
Age: 46
Regards,
Daisy