Just as an aside here, there were quite a few people complaining about the release for Twilight Sparkle, mainly saying she is an animal and should not be in the game.
She is not an animal, she can talk, and is a person, she is not a beast. This puts her in the 'Furry' category, she may not be anthropomorphic but still a furry.
I will be including her is the full game releases. If for some reason you dislike her, but like the other furry slaves, then she can be disabled by deleting the file
Slaves/SlaveGirl116.txt
She will never appear in the game.
If you dislike furries in general then disable the choice on Options and she will not appear, along with the other furry slaves. Note: this does not actually happen for the current release for Twilight Sparkle but is a trivial edit I will request of her developer