Why is my kitten sneezing, drooling, and only licking the gravy from wet food?

Cats that can't smell won't eat. It could be just a cold, or an upper respiratory infection. Another possibility since you mentioned drooling is a calici virus - they can often cause something like cold sores in their mouths and throat, making swallowing painful. In any case, she needs to see a vet so you know just what she's got, and how to best treat it. An ill kitten who won't eat can decline very quickly - it's not something to just wait out and see if it gets better or not.