Nope, you're not gonna see any universe-destroying paradoxes here as a result of someone encountering her past self.
I did this one for my fans at the blueversusred.net message board... I noticed a bunch of traffic coming from there, and after knocking about the forums I came across a thread about how much they loved it when Cassie did things with her past/future self. So this one's for y'all... thanks for stopping by! :)