Nobody had sympathy for anyone there, Sora was too weak to fight Saïx at that moment (tired of killing heartless), that's why he didn't even draw his Keyblade, and Saïx didn't want Sora dead because he had to kill heartless.
But she got killed by the dusks in a record timing anyway, Sora didn't really have time to save her (although she comes back later, so she doesn't really die )