I think the mother was not on her own when she had the 7 children. Her husband has only contributed an odd £5 or so here and there.
Some people find themselves in a situation they never planned. It IS daft and in some cases reckless.
As the mother said - getting a job is not THAT easy. She lives in one of the worst areas for unemployment through no jobs. She needs to re-train to improve her chances and she also has a child who has problems and some condition that means he is sent home from school often and at short notice.
If she does work, most of her earnings will go on childcare. Her earnings will probably be minimum wage.
The lady has not worked for 15 years - those years pass quickly when you have children. There could also be an issue of lack of confidence and fear.
No - its not ideal and yes, its a pain we have families in this situation but its very easy to sit back in judgement when you do not have those experiences yourself and to say 'well I do this and don't do that'
Good for you. Not everyone though has the education or the common sense that many of us are blessed with. Personally - I feel lucky that I am not in that position - I don't expect everyone to be as capable or sensible just because I am.