BB: What was the point of Stephanie's visit to Jackie?

There is nothing that says "I'm a bitch" like coming to someone's home just to tell them that you are out for them! I mean, what really was the point of Stephanie's visit to Jackie's penthouse? I could see if she had a purpose to be there and it just had a downward spiral. But, it appeared her reason was just to come and "stir the pot".