There are commercially-available creams for cats that contain essential oils. Although these are not necessarily deadly for your cat, it's better to consult the veterinarian first. After all, essential oils are proven to have toxic effects on pets.
Cats' bodies don't have the function of dissolving these essential oils. Therefore, they can't get rid of its toxic effects. If you're keeping essential oils around the house, chances are your cat may accidentally stumble upon them. Cats with respiratory issues are even more vulnerable to these essential oils.
To protect your cat from possible toxicity, avoid exposing her to products with lavender, mint, and eucalyptus. It's also better to refrain from having plants with a strong scent in your backyards like rosemary, ylang-ylang, and geranium. If you feed your cat with cooked food, make sure it doesn't have cinnamon and thyme as well.
If your pet is showing any signs of illness, make an appointment with your veterinarian Portland OR.