J.T.
I'm also a mother of 3 (2 boys ages 9 and 5 and a 1 year old baby girl). The listening thing just takes consistency and a calm demeaner from you...the more anxious you get, the more out of control she will get because she will feel your frustration. If I feel like I'm going to lose my temper (often :o)) I leave the room, count to 10 and think of how fun they are when they're not getting on my nerves. As far as the sibling rivalry thing...what worked (and works) for us is constantly reminding the older one that the younger one is learning from them and needs them to teach them good things. Also, pointing out and praising good things really does wonders for the little egos. When the older one acts out on the younger one, they are simply looking for your attention. Patience and lots of love and positive attention when they are being good is key in our family. Good luck and love!