Originally posted by macshorsecookies
I remember it said something about tidus's mom really being like ready to die (can't remember exact wording) so that's how she got there without being sent
The Al Bhed theorized something like one of the powers of the pyreflies was to take the thoughts of someone who had died and make an illusion of that person. I'm not wording it correctly, but the old wise person that you talk to tells you about it. If you talk to him in Guadosalam he will tell you. I would guess that would be the reason.