Sadly, despite the usual cries on mumsnet (that usually pops up,) of how you are 'just a spring chicken' in your mid-50s, you are really not. It's a shame, but it's how it is.
Very few people want to employ people over 50 for anything other than shop assistant or carer or volunteer work.
I know a woman who started a degree in psychology at 48 (finished it at 53.) She had been working as a receptionist/admin clerk with the local authority for a quarter century or so. She did the degree part time whilst still working.
She was made redundant from her LA job, about 6 months after finishing her degree. She seemed to think she would waltz into a job as a psychologist, or even a job IN a psychology department.
No such luck. All she was able to get was a job as a carer. A job that people without a single GCSE to their name can get. 3 years later, she is still doing it; and she hasn't even got a set amount of hours. She is on zero hours contract, and has to wait to see what hours she has for the next month (at the start of each month.)
Sadly, it's because of her age. Trying to start over in a new career - even a new job - over the age of 50 is very, very difficult. As I said, very few people want to employ older people, not for anything other than shop work, or care, or volunteer work. And even then, the shop work, will be (very) part time, maybe even as little as 8 hours a week, and the care work hours will be sporadic and unreliable (and often zero hours contracts.)
The woman I know, said to me (when she finished her degree,) that she was disgusted that all she could get was 'shitty little carer' jobs. (Her words!) She said 'I have a degree, how dare they offer me shitty jobs? I deserve more!' 
As I said, 3 years later, she is still doing those 'shitty little care jobs' coz she can't get anything else. Not even basic admin. Not in her late 50s.
Not much help sorry @Hmmmmminteresting but I can see why it's happening. It's because of your mother's age. Unless she has got something out of the ordinary to offer (eg, she can speak 3-4 languages,) she has very few options sorry...