To be honest it's kind of rare that she doesn't get knocked down when I roll on her, I don't know why we seem to be getting different results. I think there may be a difference in how often you get her down when rolling on her and when just jumping on her - have you tried rolling on her, or is that what you've already practised? And it's easy to land on her after some training, or at least it was for me. But of course, whatever works best for you.
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