Any advices of how to deal with a pre-teenager girl??

She is getting an agresive, hostil atitud specially with her big sister (me) haha and i would like to know how can i get to her without arguing, or without exxpresing the wrong message to her .......i`ll really apreciate any advice thanx!Any advices of how to deal with a pre-teenager girl??
Since you have an older daughter, you've obviously survived this time in a child's life once. I realize, however, that each of our kids can respond differently to life changes so it might've been different with the older girl. Your younger daughter is experiencing a barrage of stuff right now--from hormones and nearing the onset of menstruation to middle school and all that entails. The challenge for you, when she's being grouchy and giving you attitude, is to not get grouchy and impatient with her. She needs to be reminded that you really do understand some of what she's experiencing and really want to help her sort out what's causing her to be so negative and work through it or at least talk about it and know you care. It's also imperative, however, that she is reminded that you are still her mother and that mean and disrespectful behavior will not be tolerated and there will be consequences(no phone, no computer no TV, no social life) if she chooses to treat her family poorly. Even with all the changes, our kids still need to know we're there for them and we love them and are wanting to help them grow into strong, caring, capable adults. I would also suggest that you set aside some time for just you and your daughter to do something fun--shopping for new earrings, getting a pedicure together, going to the bookstore--just a girl's day for the two of you. Stay strong and be patient and know it will get easier--I promise. Take care.Any advices of how to deal with a pre-teenager girl??
Well she's growing up, I'm sure she'll grow out of it. Just make sure she know you're there for her and I'm sure things will change. Just don't start being aggresive with her because she'll only become worse. Best of Luck.
Iam 12 and I think you should give her some space because if she has hormones like me she is going to get even crazier
Get her a therapist.