I convinced the girl to set the table because the girl was my slave
Thats awful. What makes you think you can get away with making this girl your slave?
She is my slave because she has to do what I say. I do not even pay her.
Every human being should be treated with respect and not as a personal valet to you. If you want something done, do it yourself or go without.
If it's for a special event, it's okay to have slaves and the girl is my slave so I did it for her.
It's not okay to have a slave no matter how much you try to justify it. If she is doing work for you then you should pay her reasonably. It's unfair to make someone work for free.