Thank you! I was doing some research last night. And, well, I was evidently too ignorant to know that C. can't read music. (She can - better than any 4 year old I know.) And, this is too hard for her, she should wait until she is 7 or 8. Well, hogwash!
I did read that to help her use all the fingers on one hand we start with the two that are most important and then work from there. She needs to get used to using her fingers as a team. I think I am going to do a version of black cat/white cat and put it into Little Musician first. She can play it in Little Musician and then we can add another finger in a few weeks.
So, my expectations were too high, and I have no idea what I am doing.

I should learn to do the hanon exercises at the very least. I think doing a version a black cat/white cat is a starter for teaching her the hanon exercises. We've tried the hanon exercises but she gets very frustrated. She is too young to work through her frustration at that level.
I will let you know how this is working.