Short changed

This week a baby sat for a mother for a single mother who gets child support and babysitting paid for by her baby dad. This week I worked 30 hours 12 hours Monday 12 hours Tuesday and six hours Wednesday. She gave me $60 for the whole time I was babysitting $60 for 30 hours I don’t know what to do I feel short changed and extremely dishevelled I worked my ass off for 30 hours and only made $60 I could’ve made more sitting on my butt

EDIT: my sister usually babysit for her and makes $120 for working 24 hours 12 hours one day 12 hours the next. My sister was away so I agreed to babysit for her payment was not necessarily agreed but considering what my sister usually made I thought I would make about the same.