Aye it does somewhat. I'm wondering more about how she got passed Sai and/or the others in her group, plus whether she's aware of what Sasuke did to Karin prior to her asking to join. Will be interesting to see her reaction to Sasuke "finishing off" Karin, or whether he'll even do it or not. Possible double-switch (Sakura with the bad guys, Karin turns good)??? 8-)
Given her mindset and speech to Naruto, I'm inclined to think she's joining him in order to try and catch him off-guard. She just got lucky that there's an opening in the healer department.