The only thing you can do is keep plugging on - play games with them both involved to help her learn to share and take turns, praise each for the little things they do and for kindness to each other... things like that can make a big difference.
With toys, in my house, everything is mine and I share! Simple as that... similarly, when they fight, I ask children to think about how the other child feels to be shouted at / hurt / pushed etc and how they would feel in the same situation.
Do you have any books about emotions you could share with both girls? Another idea is to introduce a puppet who maybe shouts a lot (in a funny way) at one of the dolls, so the girl can see what effect her behaviour is having on others?
Hope this helps
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