I hear you guys mentioning it a lot, we don't get it here in Australia. I'm gathering it is used to calm cats down?

As for Orangina, some cats just aren't social with other cats. In most cases, they will eventually settle down to mutual respect, or grudging tolerance. My Mum's two are mother and daughter and used to fight like that. After awhile, they learnt to live together without too much fur flying. It will probably just need more time. Try the feliway ... whatever it is! It may help also!

She sounds to me like a dominant female! Especially if she's taking on the boys!