I have had some trouble when teaching my own child with other kids. I think it can be hard for a child to have to share mom, and there can be some acting out. I've seen this in both my 4yo and my 7yo, and other homeschooling moms who have taught a group of kids that includes their own have had the same probem--even when they're teens! We were commiserating about it one day, so I think it's pretty common to have some trouble.
I'm not saying don't do it. But I would prepare her ahead of time to share you, and I wouldn't be surprised if she acts immaturely compared to her usual behavior sometimes.
Teaching your child one-on-one is very different from teaching your own child in a group, I'm afraid. Kids have trouble recognizing the changing nature of your relationship from "my mom" to "teacher for all these kids."
