Feeding a rotation diet is a great idea for a lot of reasons.
Since your pup is still so young it’s best to keep her on the Wellness until 6 months. Once she’s 6 months old, then you can start the rotating.
I did the same thing as you. Once I took my guy home I started him on Wellness Core Puppy. I wanted him off the Purina ASAP. I had trouble finding an easily available brand with less than 1.5% calcium. (He’s a large breed so I have to be careful about that.)
It’s best to leave things be for now. Puppies have very sensitive digestive systems that aren’t really ready for a lot of dietary changes. If the Wellness works for her don’t mess with it.
