I'd love to know what reason she's given the DWP about why she can't work! What do you reckon? Bad back? Depression? Anxiety? Fibro? She might find she feels better, just with a part time job. She would socialise, earn her own money and feel more fulfilled instead of begging online.
I think once you get trapped in the spiral of not working, it's hard to get out of it. Even volunteering would help! Sometimes you need to step out of the comfort zone of your bed or sofa steph, there's a big wide world out there!