Even if this 'someone you know' had spent all her adult life working, she would very likely STILL be in a position where she was struggling financially/on the bones of her arse, if her husband fucked off and left her in her mid 50s. Despite what some posters claim on Mumsnet, the vast majority of women are NOT high earners and WILL struggle on their own if the husband leaves. Even if they have always worked.
Because despite some women on Mumsnet claiming they earn £75K-100K a year or more, the vast majority are on basic pay/probably less than £35K a year. And despite some women on here claiming that they earn 3, 5, or 7 X what their husband earns, the vast majority earn less than him - some significantly less.
At least this woman (that you know,) had a wonderful life of luxury for 30+ years, and hasn't had to go into a tedious minimum pay job until she was 10 years off retirement. SOME women have to do shitty dead end jobs for 50 years (from when they leave school until retirement.) Even when they are married, and have children, and are taking on most of the mental load, and home admin, and housework, and gruntwork, and childcare.
IMO the women who are Stay-At-Home-Mums/Homemakers have the much better deal, even if their husband fucks off with another woman when they're 50-odd.
Seriously what married woman (especially one with children,) would choose to do some shitty dead end job working for 'the man' for a pittance, when you have a financially well-off man who is happy to support you, whilst you raise the children and look after the family home?! (And pursue your hobbies and interests that you have plenty of time for, because you don't have to go out 50 hours a week to a shitty, boring, dead-end, low paid job!)
Seriously, the Stay-At-Home-Mums have got it made! And they know it. And so do some women who are forced out to work because their husband won't let them stay at home! Or doesn't earn enough to look after them, the home, and the children! And that is why the latter (the working women) are bitter and angry. They won't admit it though, as many of them don't even realise it.
disclaimer I am not saying ALL working women are bitter, and jealous of Stay-At-Home-Mums, but some are, and there sure are a few on Mumsnet!