I nannied for two summers when I was younger. Once for a family with a 4 and 2 year old. Once for a family with 7 and 10. Each time I basically did:
All childcare
preparing and cleaning up after meals for kids
planning and organizing daily activities
driving to lessons
I did some very light house work, but nothing that checked a box of the cleaning list for the parents (if that makes sense). I made sure that the house was as clean at the end of the day as it was at the beginning. So I...
made beds/supervised kids making them
made sure toys got picked up and put away
picked up yard toys
cleaned up the kitchen after meals
-loading dishwasher
-wiping down counters
-hand washing as needed
-running dishwasher if full
-unloading dishwasher IF I had started it AND I had more dishes to load
-sweeping kitchen floor
Once a week or so I would do (or have the boys do) a couple of loads of laundry, but basically just putting it in the washer on our way our for the morning, then moving to the dryer when we got home for lunch and throwing another load in. I MIGHT have folded and put away the little boys' clothes, but definitely NOT the bigger ones, and not the parents.
With the younger family, one night a week I would prepare the family dinner before I left, but I neither served nor cleaned up after.
I also did reading readiness with the little boys and worked on reading with the 7 year old and math with the 10 year old.
I think what you pay depends on what you expect her to do. I imagine you are already paying what you are comfortable with, so I'd probably have a frank conversation with her about your expectations and be willing to compromise a BIT there, but who knows. When I was nannying I was not live-in an I made about $350 a week.
HTH
T.