'I would be very interested to know if anyone has any further information about what happened to Annie after that'

Looking on Ancestry, there are a number Annie T FENWICK's including.....

British Phone Books -

Annie T Fenwick - 1949, 1950, 1951 - 8 Compton Place, Eastbourne.

Eastbourne is an area where lots of people retire to.

or

FreeBDM

Marriage J/A/S Atr 1919 - Barton I District

Annie T FENWICK
Henry P HARRISON