Baby sitting?

I have a 3 month old and and a 3 year old. I started watching my neighbors kids yesterday she has a 7 month old and a 2 year old. She said she will give me $100 dollars on the 17th of every MONTH. I just really don't think i can handle 4 kids everyday its from 4-8 or 4-9. I could watch the 2 year old for $100 how do i tell her? I just dont think its worth it at all. I am getting the shit end of the deal.