" There would really be no point. Once a soul dies it doesn't remember it's former life. As stated in the beginning of the series. If he found her, she wouldn't have any idea on who he is. "Phew! nice save! I was almost worried we'd have to admit that it was another unexplainable plot hole.
This. I don't remember them saying they wouldn't remember anything after dying (maybe a bad scanalation?) but I've always assumed its because she was attacked by a hollow. I don't remember exactly, but aren't spirits whose souls are consumed by hollows either destroyed or made into hollows themselves? I always assumed it was because her soul was destroyed. What did Ichigo say to Isshin when they visited her grave after the Grand Fisher fight?
" @Kas: also remember, kubo always changes his mind about everything lol, bleach is full of plotholes, remember the parrot kid, when he went to soul society, he still remembered Ichigo and Chad didnt he? "