If you don't feel comfortable with the above solutions or they aren't totally working for you, another thing you can do is request to have a partner teacher called. I once served as a primary teacher with Man, Certainly, and it's much easier to have a productive lesson when you've got one person who can focus solely on kid-wrangling so that the teacher isn't having to say "Ok, so everybody go in your Book of Mormon to....Karen, stop licking Jack and get back in your chair."
In terms of "how do you not hate her:"
Well, on the bright side, this is a really good bonus-level chance to develop charity. I've been struck recently by the idea of Matthew 5:46, which queries "For if ye love them which love you, what reward have ye? do not even the publicans the same?" I think that applies to a ton of places in our lives. It's easy to serve my hip, cool young mom visiting teachee with the two adorable kids. It's harder to be willing to go on an uncomfortable lesson teaching someone I don't know in a poor part of town with the missionaries in my ward when it'll probably get cancelled anyways. It's really hard to eliminate all bad thoughts about that one person who just gets on my nerves.
So don't feel alone, because you're not. Almost everyone on earth either a) struggles to have charity for certain people or b) only doesn't struggle because they aren't trying. So, a few thoughts:
1) When he was on his mission, Prof. Kirke wrote something home to us that's stuck with me: he commented that he had learned he didn't have to like someone to love them. On his mission he was dealing with people who would make choices he disapproved of and who he probably didn't have a lot in common with in terms of qualities he'd generally look for in friends. However, as a missionary it was his job to serve them regardless of whether the qualities that he typically "liked" to see in a person were present or not. You can dislike the fact that this girl is disruptive, or frustrating, or knows better, or whatever, and still love her.
- This article discusses the link between charity and patience, and gives specific steps for how we can improve our patience (and therefore our charity).
- This article identifies "the doing, the serving, and the praying" that can increase our charity
- I'd also recommend considering how you can better prepare yourself and un-wind yourself from dealing with this stress. I'd consider looking for strategies that help you control your stress level:
- Before class: This may include knowing and reminding yourself that you have a partner who will teach with you, that you can go to the primary president if [Student] is out of hand (and promising yourself that you will), doing what you can to prepare a lesson using any techniques you have or later find effective to minimize opportunities for disruption
- During class: This may include finding a mantra to remind yourself to be patient, to remind yourself that you only have to teach this class for 2 hours and then you get to go home, etc.
- After class: This may include finding a weekly "reward" that you get after doing your primary lessons. A bubble bath, a mug of hot chocolate, a foot massage from your husband, etc.