Well she's much bolshier about it in TSP than she is in TWS:
I looked for work, but in such a rural area there was nothing that paid more than enough to cover the petrol costs to get to the job. And who wants a fifty-year-old woman whose work history for the last twenty years has been self-employment? It didn’t count that I’d been a farmer, plumber, builder, electrician, gardener, decorator, designer, accountant, tree surgeon, and run a holiday let. I had neither a piece of paper or an ex-employer to prove it. I would have to retrain.
This is obviously patently untrue, as we know that, certainly after they went to live in Wales they were only 'farmers' in the sense of having a two-acre smallholding with some sheep and hens so they could call their holiday let a 'farmstay', and that she had at least two jobs outside the home, book-keeping at the Abersoch hotel and at the Hemmingses.
(I mean, I can absolutely believe she had some basic skills in plumbing and electrics from renovating their place, but no one is going to want to hire someone with no actual qualifications in these areas! And anyone with a garden and a house is going to have done some pruning of trees, decorating and gardening. I did like the inside of their house on Escape to the Country, though I'm not sure what 'piece of paper' she thinks would make her employable at any of these things...?)
The reason, of course, that she has to claim a blank CV, 20 years of self-employment, and no ex-employers to give her a reference, is Martin Hemmings.
But yes, I agree that she's appropriating prejudice against middle-aged women with spotty or dated CVs due to caring responsibilities to make the fake past she's invented to cover up her criminality more 'relatable'.