Over the last weekend, Divas Champion Nikki Bella didn't appear at any of the live shows and mentioned in Twitter that she's currently rehabbing a back injury.
Apparently, back in July, Nikki was wrestling despite a partially separated shoulder that was causing her some discomfort. There's nothing to indicate that this is the same injury, but it's definitely in the realm of possibility. On top of that, it's unclear whether she'll be available for SummerSlam at this point. If any more news on her injury issues surface, we'll be sure to keep you posted.