I'm so sorry for your loss!
I came to this thread through Twitter. it was posted just a few moments ago, so I guess they didn't read through the whole tread before adding it.
As to your original question (because I'm sure it will show up in searches from time to time) as long as the kitten wasn't horribly emaciated when you got her, then yes, you can feed her all she will eat. If she hadn't eaten in a long time, unlimited food could over whelm her tummy and she should be fed in small meals every couple of hours for a few days and would be best to be under the care of a vet.
Dry food is not the highest quality food out there, even the "premium" ones. They are too high in carbohydrates to be considered a good diet for obligate carnivores. Check out http://www.catinfo.org
a website run by a vet who actually studies feline nutrition.
you should never wet down dry food and leave it out for any length of time. There are many bacteria and other organisms on it that while harmless in general if you wet it they will grow out of control and quickly become harmful for the kitty.
I foster kittens and will often open more food (canned) than the kittens will eat in 10 minutes so they'll have snack later on in the day. I've been doing this for years and haven't had an issue with it.