I think she may be okay la. 4 yrs contract with 1 employer are better.
May be too busy for her to take care 2 kids together with cleaning & cooking.
My kid eating dinner (rice) by herself but she is 14 mths only. No need feeding by helper. You must training your kids independent.
You need to talking with your kids, why they don't like this helper go to school with them?
Also, you must training your helper how to take care your kids.