I guess one thing that I would do is when she talks in a tone that you don't like, I would say something like, "I'll listen to you when you can talk in the same tone that mommy is talking in" or something like that.
As far as her friends and being a bit bossy, I'm guessing is what she is heading towards, you can say something like (coming from a Love and Logic book):
MOM: Daughter, I notice that you're kind of bossy (or whatever) with those other kids. Do you ever worry that this might make them not like you? They wouldn't be your friends anymore then."
DAUGHTER: "Aw, they'd still be my friends."
MOM: I just wonder how it'll work out. Of course, you might be one of those rare people who can boss others around and still make them be friends. What do you think? Have you figured out any ways you can boss them around and still keep them as friends?"
DAUGHTER: "I don't know."
MOM: "Well, I'll be interested to watch and see how it goes. I hope it works out for you."
Chances are that somewhere along the line it won't work out. She'll learn her lesson rather quickly and when she comes back to you to talk about it again, you can express sadness and great empathy (not I told you so) and say something like 'it didn't work out huh?" and 'that's really sad' and 'what are you going to do?'
You have to put the burden on their shoulders and let them figure it out. They'll be smarter about life because of it. You are to 'help' them see the light without telling them not to be bossy or sassy or a know it all with her friends. If her friends get tired of it, they'll let her know in whatever way and you'll be there to consult with her about it and lead her in the right direction while SHE does the thinking about why it didn't work out.
Just remember that if you tell her not to be so bossy or in that way, she'll more than likely continue the behavior..just get her thinking about the above and what could happen in the future.
Well, I hope that I wasn't too long winded and I hope everything works out. She sounds like a blast! I know you must have lots of fun with her. :0)