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Hi I am Dr. Pulter. I will be helping you with your question. Give me a minute to respond.
Can you answer a few questions for me? Do you know of any toxins that she may have gotten into? Any plants/flowers? Any vomiting or pawing at the mouth?
Drooling can indicate nausea or oral irritation. The sore may be causing your kitten to drool. What is causing the sore is a little bit harder to determine. Sores in the mouth of such a young animal usually points to some type of irritant that they may have gotten into. Please look around your house for any indications of Freya getting into something. Also toys can cut the mouth so look for sharp points on toys. Other more serious causes could be something going on the inside such as Calici Virus, which causes oral ulcers and respiratory signs or end stage kidney failure. Something you can do right now it to try to rinse your kittens mouth with water. Ideally Freya would see her vet soon. In this modality I cannot diagnose or prescribe treatment, But if you have any other questions I can do my best to answer.
You are welcome. I hope Freya feels better soon.