Hello, and thanks for writing in.
Sorry to hear Lucy is not feeling well today.
Are there any sores in or around Lucy's mouth?
Good. Oven cleaners are very caustic and will commonly cause mouth or lip burns (or internal burns in the digestive tract if actually swallowed. Other symptoms would include gagging, vomiting, having a difficult time eating and drinking.
Are there any sores on the back left leg (i.e. bottom of pads)?
Thanks. I guess it's still possible that she may have ingested oven cleaner, but overall I would say it's unlikely (especially without any mouth burns). There are other causes for a kitten this age to not feel well, such as some type of infection (very common in kittens), or if she may have injured her leg somehow (falling, jumping, etc.)
I would not give any type of human pain reliever to her, as these can be very toxic to cats. You can try offering various kinds of food also, such as canned or dry cat food, tuna, salmon, cooked chicken, cooked turkey, chicken or turkey baby food.
You can offer water, low-sodium chicken or beef broth, or water from a can of tuna to get some liquids into her.
Yes, a sore leg can cause lack of appetite - we see this commonly.
I understand. I would at least have it available for her to eat if she wants it. Otherwise, I would recommend keeping her activity level quiet overnight, and get her examined by a veterinarian in the morning if her symptoms are still present. They will be able to get a better idea as to why she is not feeling well. Other than a good exam, they may recommend a blood test or X-rays. Then, they can treat appropriate for her, including pain medication that is safe in cats.
If you have an animal emergency clinic in your area, or a veterinarian that takes after-hours calls, you may be able to check with them to have Lucy examined tonight, if the need arises.
I would not worry about dehydration if she is not having any vomiting or diarrhea. If you are able to, you could also try giving some water with a syringe or turkey baster in her mouth, just to get some fluids into her.
You're very welcome - glad to be here to help out! I hope everything goes great, and I hope you and Lucy have a good rest of the night.
I sure understand about your concern about your little one - she is lucky to have you as her friend!