diet... all cats need high fat high protein diets. I would get kitten chow for the extra calcium it has-- Eukanuba is the best one IMO. Once she starts to fill out, check her teeth. This is where cats may show alot of damage.

I would not use any soaps on her or wipes. If she is really dirty, and this is NOT petroleum based dirt, I'd just put warm water on a paper towel, and stroke her with it. A fine toothed comb from the pet store (flea comb), will remove fleas and large dirt. Drown the fleas if they come up in a dish of liquid dish soap and water (rinse the comb before grooming again). Wipe her down so you don't transfer any soap back to her--it will make her vomit. A good flea comb and groom will take care of most flea problems if done every day for about two weeks. No chemicals are needed.

Oreo was very healthy when we adopted her, but she was covered in fleas. I had to comb her alot! Cats can really like to roll in the dirt...Oreo does this up North, where we feed the deer. And they will do this in the street too! Oreo can turn herself gray on her white parts, with it. This drives me nuts...but they always appear clean in the house.
So "dirt" is a relative term for what appears on cats sometimes.
Any oil residue, or gasoline should be removed at the vets.

I wouldn't get shots for her until she is stronger.

edit to add... this picture was on icanhascheezburger.com
appropriately this morning! LOL