No oragel has ingrediants that are not safe for cats.
What is wrong with her?
toothche, teething, other?
is she eating?
I know you are worried about your baby but I promise you cats ont have any severe teething pain like human babies. They instinctively know to chew on things if they are uncomfortable.
Any products like oragel would just make her drool and may be dangerous for her.
If you think her mouth hurts let her bite on a toy or cloth that you have chilled in the fridge,Or freeze cubes of baby food with no onion in an ice cube tray and let her lick one.
If your get worried,, I will always be here for you.
Sincerest best wishes,