I'm impressed. Overall you have all the basics and have done a good job of getting what you need for your new bunny!
There are a few minor tweaks you could consider...
I noticed both the pellets and the hay are timothy. That's just fine for an adult rabbit. For such a young (8 weeks) growing rabbit, alfalfa-based pellets would provide more nutrition. Oxbow Essentials does have a
young rabbit version of their pellets. Just bear in mind that whenever pellet brands/types are switched, it's a good idea to do it gradually by mixing the new in with what the bun is used to eating. If you switch the pellets, still stick with timothy hay. Babies don't need for both the pellets and the hay to be alfalfa.
Another possible tweak is the location of the litter box. But that depends on your rabbit. Many rabbits prefer to have their litter box in a more secluded area of their habitat -- either in a back corner or perhaps under the shelf of an upper level.
As for the carpet on the floor, again, that will depend on your individual rabbit. Some will chew and ingest carpet (which obviously means it can't be used). Others won't bother it. And then some won't bother it until their hormones kick in and they become excessively destructive with their chewing! So it will probably be a "wait and see" kind of thing.
Of course with a 4 year old, you'll need to teach her how to interact with the rabbit. Picking up the rabbit should probably be a no-no for your daughter. Best to have her just learn to pet bunny while bunny is lying comfortably on the floor. Photo below is of my youngest learning this (many years ago).
For further rabbit care info, you may like my website:
https://rabbitsindoors.weebly.com/
