Yes, as suttontrust says, a Doble-Pinney marriage around 1940 would be very easy to check on 1837online. If you find it, it would be fairly certain Edith had died earlier.
I would imagine that Edith Doble is a sufficiently unusual name that an 1837online search for deaths during (say) 1925-1939 would turn up only a handful. If any of them that are late 1930's are in the same district as the Doble-Pinney marriage, it's highly likely to be the right one.