Humiliation*

I'm looking for ideas, I've looked around and goin some good ones but everyone always has something good to add so I'm putting this out to the public.
My sub enjoys a certain level of Humiliation*and I enjoy pushing her limits. I was looking for any and all ideas on how to push her further.
She already has to ask to use the restroom and to eat.
What I am looking for are new areas of the day to turn her face bright red.
Oh yes, right now we are online only.
Thank you for your time.

Here is a couple of ideas. One, have her dress provokatively and send her to a pet store to buy a dog collar. Have her have it initials engraved on it or maybe some other phrase that would be code or even overt. Two, have her write the word OWNED around her anus in magic marker so that it is hidden when her cheeks are not spread but becomes visable when she bends over.