I was really worried for a minute there that Miss Professor Carrow would decide that since you'd volunteered to take Perks' place, you could jolly well duel your classmates, and if something fell on you, that just meant you should have moved faster. Like Parkins

I'm glad everything worked out.

And you shouldn't have to bring your servant to class unless you want to. She's yours, not Miss Professor Carrow's. She can get her own mudblood if she wants one, the camps have plenty.