User blog comment:IamThorn/Ruby watched Summer Die/@comment-24177652-20140829111152/@comment-4010415-20140902162645

They've been really vague about whether she is dead or will die, and the fact that they say "Summer is Ruby's mother" doesn't really outright say that she's alive. The fact that Ruby only said "my parents" once and then, from then on, only says "dad" kinda points to Summer already being dead, though.

As for her seeing the blood... I've ended up thinking that she saw the blood when they brought her body in from the battlefield. Summer had to have already been dead when they brought her from the battlefield, though, because her lines in the song say that she was sure she would see Ruby when she made it back home (implying she did not see Ruby), that she feels that she abandoned Ruby, etc etc.