Gospodyni is when she's cooking for you.
Also, is it normal to pay per hour worked?
Yes. Usually babysitting hours are cheaper then cleaning hours. You can ask babysitter for some laundry folding, wiping high chair and loading/unloading dishwasher when the baby is sleeping. Cleaning lady will do much more.
Mine gets 80zl for about four hours' work cleaning the flat
So that's about $7 per hour. Poland is still relatively cheap. I pay mine in Canada $15.