I love the way this woman has gradually morphed into someone from the work house having to beg for scraps. It's total fiction.
She's working - we don't know if she works full time, we ceratinly don;t know she;s starving, but if I was desperate and starving I wouldn;t take biscuits, I'd take bread cheese, meat, milk, eggs - stuff you can actually feed yourself with, not biscuits.
So chances are she just a greedy fucker - but I don;t know, so I won't invent an entire life for this woman away from OP's house. I would guess she is somewhere between the little match girl and an international biscuit thief, - i.e. just a chancer who thinks a few biscuits don't matter.
I worked as a cleaner on many occasions, it's hard work, but not back breaking, it's reasonable pay and it's convenient if you've got kids because the hours are often within school times or very early morning/evening which means you can do other work as well.
I never stole food or anything else, but I've worked with cleaners (and housekeepers) who thought anything not glued down was fair game - food, squirts of expensive perfume, a few chocs from a box, cash that was lying around etc etc. Some people think they are entitled to help themselves to stuff just because they are dishonest, not because they are starving.