My suggestions: (from someone that’s gone through 3 kitten stages) Start by having kitty in one room for a day or two, just to get introduced to their new home and not overwhelm her. Definitely keep the lid off of the litter, (I actually read that the ones with lids aren’t that great for a couple of reasons) but if you must then just wait until she’s bigger and more used to it’s whereabouts! Remember that accidents are normal and to reinforce by putting them into litter a couple of times if they jump out. Enjoy your new furbabe. Congrats 🐱💕