Anyway, nobody wants to last forever, including her. She has lived for a long time. It won't work if she commits suicide, that's why she needed the help from Squall. This implication wasn't used in this game, because if it was used, Squall would be given fewer chance of killing herself, he just runs away, becoming more emotional or whatever.
That's flawed though, if Rinoa dies on the ground, the angel still revives the others. I have another theory on this one as well. That Rinoa may be part of the Ulti's plan also (Ulti giving her powers to Rinoa), because I believe U=R, not R=UMost of the 'good angel' motif applies to Rinoa. The wings on the back of her outfit, the Angel Wing limit break. Heck, even her dog is named Angelo.
Yes, sometimes angels don't show up but I think that's because Ulti was getting badly hurt off and on at a time.
