Originally Posted by Cat Herder:
Unfortunately, I don't see another option at this time.
Your daughter is telling you that mixed age care is not for her. That is ok. 
There are as many types of daycare as there are many types of children. 
Your daughter will most likely greatly benefit from being in a larger group of same aged children, instead.
A change of environment is exactly what I'd recommend to you as your provider in this scenario. I have been in business, successfully, 23 years, now. It is not you, it is not the provider, it is simply the environment and mismatched needs. 
I agree with cat's responses to you.
I suggest you find a nursery school, a center that has a 2-3 year room, or a provider who only accepts children 2+.