OK! Deep breath! What did you use in your kitty's ears? How is she doing now? Depending on some things, certain ear cleansers are safer than others...also how you follow up, with Q-tips or Cotton puffs, make a huge difference!
You don't want to go poking around in the ear!
Depending on what else is going on, you may need a vet check, to make sure it's not a fungal infection! Will require different treatment...
Did kitty get some of the ear cleaner in her mouth?
Is that what you're referring too?
If so, can definitely cause foaming!
Usually, not to much to worry about!
Hopefully kitty is doing well now?!