Glad to hear she's loving Da Bird! I honestly can't convert to metric. So maybe someone else here can tell you about the calories. I truly have never even looked on anything I've fed Raiden. He's at a good weight for him and it's never been a real concern for me. At least you've got her playing again .... and that was the whole point of your original post. I think your girl will be fine.

I think a large part of her lethargy was based on the change in schedule. I'm starting to see some correlation that way when play times get altered or if the amount of duration is changed. Da-bird helped.

TLDR this entire thread: changing your cat's schedule may lead to a change in temperament or activity level until he/she readjusts.

Cats love a routine! They get on a schedule and that's it! Any change can bring about changes in your kitty! That's one thing I've learned in 55+ years of owning cats.