MRS WSS is Polish - always has been, always will be. She is not a British Citizen, never has been, probably never will be either.
She works, so technically can be classed as a "Polish Worker".
She is on the electoral roll - so is her mother, who is retired, and no longer works, but does pay her council tax - and is eligible to vote.
It is only apathy on her behalf that means she never bothers to use that vote.