Should I have her de-clawed?
I would personally not recommend de-clawing. If you find scratching over time (and there should be time to get used to the environment) you may see if the nail caps would work. I don't personally know someone who has the caps but I do know they are an option and I would strongly recommend that as well as techniques for minimizing scratching where you don't scratching before even thinking about declawing. Personally I still wouldn't declaw though but that's just me.
Our cat is not declawed and is pretty darn good to be honest with claws.
That's a personal preference but you could talk with the vet. This is just an opinion but our vet advised to stay away from Indoor Cat formulas because from what they had seen more urinary issues arose from that.
When we adopted our cat the shelter/rescue sent us home with some Pet Fresh food (that's the refrigerated kind) and our cat loved that, then when that was running low we went and bought kitten formula of Purina One Smartblend. Once our cat was 1 year old we moved him to Purina One Smartblend Healthy Metabolism (as he is neutered). Each time we did a slow switch where you blend the food in with the new food in order to help the cat get more slowly used to the new food.
Our cat had a bladder stone shortly after we moved into our house so we added Purina One Smartblend pate wet cat food to his diet. We also got him a water fountain as well. Both are designed to give him more water in his diet. Some cats love to drink water but my vet said by nature cats tend to exhibit characteristics of their ancestors that were desert species who don't tend to drink water as much as they should.
We feed our cat 1 can of wet food per day plus dry food that is in an automatic cat food feeder. The dry food is given to him twice a day at 1/4 cup per day.
Our cat hasn't been picky at all when it comes to food with the exception of the wet food. We had tried the gravy kind (where it's larger chunks mixed with a sauce) and he just licked the sauce up and left the larger chunks but he'll eat the pate version so that's what we buy him.
In any case I would talk with the vet to see if there are recommendations they could have. Price of food may determine what kind you get.
Do self-cleaning litter boxes really work?
We looked into that but the cost was more than we wanted to spend for good ones.
We ended up choosing a rolling litter box where there is an internal grate that catches the clumps so you're not scooping-you do need a clumping litter though. Not all cats like enclosed litter boxes but ours hasn't had an issue with it.
Here's what ours looks like:
The grate is only visible for the picture. When it's in place you can't see it like that.
Anyways that's just ours.
That's up to you but we use Tidy Cats (either the Instant Action or the Glade version) clumping litter. I wouldn't personally choose the light-weight version as I've heard a lot more issues with the litter dust being worse. We feel the dust is pretty minimal with normal Tidy Cats version.
What's the best way to clean her?
IF you want to bathe her it's usually best to start early when they are a kitten to get them used to it. Majority of cats do not need to be bathed but if allergies are a concern you could bathe her. We gave our cat baths when he was younger and every now and then give him one now. He's not the most fond of it but certaintly isn't like the picture of an angry scared cat when you think of cats and baths. You may think about putting something like a towel or something like it on the bottom of the tub for stability since the tub floor may be slippery. Mostly our cat just looks at us like "why must you get be all wet" lol.