That isn't possible. Liz is a slave. That would be clear. Anyone who was bought in a slave market would be mark either with a collar or with a tattoo. This way everyone knows they are a criminal paying off a debt. If she had owed Bastian a personal debt than she would have more freedom because she wouldn't be marked. But she is a criminal, sort of, and as such would have something to identify here as a slave. I have mentioned this in Liz's post more than once. 

I see. So Liz has to approach everyone trying to figure out who things Bladed Beauty is. That will attract alot of attention especially since no one is likely to admit to having a code name. No we need a way to identify this person.