I have a 6 month old kitten that has been acting a little off since this morning. She's been less playful. Sitting and sleeping more than usual. I offered her food in the morning and she wasn't really interested in eating it. I offered it about an hour later and then she did eat. A few hours later, I saw her sitting again and noticed a small amount of saliva at the end of her mouth and when I touched her mouth/underneath her jaw she started meowing as if I was causing her discomfort. I tried pressing other areas of her body and she didn't react. Only when I touch her mouth area she meows and tries to move away. Any idea what might be going on?