atleast it sounds like she has high self esteem
high self esteem = confidence
confidence = chicks! err i mean "gorgeous guys"
Children of this age are learning about social skills - it takes time. Try not to compare her with her sister. Children's development, including the development of social skills, does not proceed in precisely the same manner with all children. It is important to step in and manage the behavior if it is hurtful in any way. Bossiness in itself needn't be addressed beyong trying to offer a little guidance - just don't have unrealsitic expectations about how much she'll follow the guidance. If her behavior hurts others, of course you should set limits and discipline her. School will take care of itself; her teacher will help her. On the home/neighborhood front, perhaps it will be helpful for a while to have her play with only one child at a time. This will be less overwhelming for her, and it will permit greater ease in changing some of her behavior. If she pulls away from peers and tries to gravitate toward the adults, ask her what's the matter and what might make it better. Try not to rush in with answers or suggestions; allow her to address the situation, with your assistance.