There is a Mair Evans with that birthdate as a house servant in 1939
Pengwern Hall, Llangollen, Llangollen U.D., Denbighshire, Wales
No name changes, so not married in UK anyway.
There is a Kettering death in 1963 for someone age 41. Which I suppose is possible. Funny how we (I) think it more likely she emigrated than moved to Kettering.