I think it was Hinata's blood but i dont think he killed her. A Narutolike genius Hyuuga could force all their chakra somewhere or temporarily shift it off to appear dead to even Dojutsus. Maybe she sent it all where the attack was coming from. Maybe she too has studied under Tsunade after seeing Saskura and Ino getting stronger and we just dont know, and learned a self healing trick like Tsunade. anything is possible with Kishi, but i dont think she is dead, but to support your theory, u cannot take your eyes of a future genius woman who is fighting for her love who she tries to live her life like, not even for a second like http://read.mangashare.com/Naruto/ch...7/page013.html
. Never give up.