On a serious note, you think there's some stipulation in the contract to the effect of "If I don't feel safe I don't have to honor it"? With armed guards and lawyers there I doubt she (or anyone) is in any physical danger. The tweet is probably there to give her an out without being a breach, maybe.
Holy shit, I didn't even think of that. Imagine Ty or one of the ALODs (Ty did say ALOD were coming, right?) waiting in line for fifteen minutes for Monica's autograph, and when they hand over the item to be signed, it's papers.