Earlier quoted context omitted.
What about it seems “not kids friendly” to you? I don’t see the problem.
'On your kitchen' is not something most English speakers would say; they would say 'in your kitchen'. Otherwise it seems like the butter is 'on top of' the kitchen, like on the roof. And instead of 'your kitchen' it would be 'the kitchen', since the story takes place at the house of the characters in the story and not the reader's house. Also usually children's books are much more descriptive: "Butter went everywhere…
The exact quote is :
>But then she noticed something even stranger - her kitchen was covered in a thick layer of butter.
vs
>Butter went everywhere! On the ceiling, on the floor, on the refrigerator, on the toaster
Your phrasing sounds like something I'd read to my son and I could see him repeating all the items and adding some of his own.