The entire reason why the Oracle knows what is going to happen, is because the timeline of the world of the matrix plays out over and over again.
Essentially a mirror of the last time through.
Most importantly, the act of the Oracle telling Neo not to worry about the vase itself causes him to break the vase. (The answer of course is no.)
Her next line "you're cuter than I thought" implies that she is experiencing a new history, because this is not her first time through the Matrix timeline.