She hasn't screamed and shouted at others in the way she has Shilpa, but that's only because the 'stock cube row' (which, be fair, Shilpa did instigate) was the latest in a long line of disagreements and as such the animosity has reached a head. When it came to, say, Ken - they never got beyond a couple of minor altercations, but it would have got worse. And Jade only started screaming after a number of heated exchanges - not immediately, as though she couldn't help herself.
Besides, the remarks of Shilpa's that I mentioned earlier were made last week, before any of the outright screaming matches.