ABANDONED. Fantasy adventure - angry girl with broken backpack - world in a box . - not dora - kinda dark in retrospect

[Toaster]

So there's this book I read about 5 years ago. It was about a girl who abuses her toys and has anger issues. She got a magic box from a passer-by wizard that sucks her into some isekai. She met her old, broken, abandoned backpack and adventures with it. She got captured by a family of birds but gets out by messing with the clock and building a paraglider. She also messed with the bird boys with some riddles that confuses their computer. There's also a beaver who's some kind of antagonist. In the end she found a huge palace with record player, big carpet, and riddles. She faced all her past abused toys who wants revenge. And at the end of story she got turned into some deformed monster in order to change her toys back to their old form. Then some fairy came in and be like "there's more than one form of magic" or something like that. She went back to her world and became a better person, her toys and backpack were back to. And in the end of the whole book, like the last part of the last chapter the beaver shows up in a snow globe(replication of the box world) and said something like "laughs last laugh best" thing. I read a translated version so the quotes probably isn't exactly the same.
Does anyone here knows anything about a book like this?

[Toaster]

bump - new information: the girl was mentioned to have red hair at some point of the book as I recalled.

[Rainbowheart]

How old was the girl?

Was this children's, teen, or adult fiction?

[Toaster]

Rainbowheart wrote: "How old was the girl?

Was this children's, teen, or adult fiction?"

I think its a children's book, the girl is like 10-12

[P.]

I would read that myself

[Kris]

No response, moving to Abandoned folder.

Toaster (OP) was last active on the site in December 2019.