I have studied medicine for years and have never heard of any instance where someone needed SIX biopsies in one day.
Side note: we rent. When we moved into this house, the landlord was so relieved to have GOOD people renting, because the previous tenants manipulated him. The mom said her son had cancer or something, so rent was always short because of 'medical treatments'. Come to find out, they're just criminals. Being the person I am with the connections I have, I found her, her kids are healthy, and the land lord got the 6 grand she owed him.
My point is, I think you're being given the run around, and I've babysat for FREE before. I'm not a sucker. I think you're being taken advantage of. If it's 'not looking good', it's because she's playing you like a puppet, going to make you feel sorry for her, and then she's going to pull the plug... and find another sitter without paying you.