Im Holding Onto All The Unhinged Shit Lenore Did In Life With A Deathgrip. She Was Just As Obsessed I Swear— *gets Dragged Away* - Blog Posts

About their memories. Annabel lee isn't just going backwards and lenore forward; Annabel is remembering faster and more compared to lenore

Moreover Annabel remembers the trivial memories, the supposedly less important ones.

For example Lenore would remember Annabel's first and last visits while Annabel would remember lenore showing up as Leo and a casual picnic together.

So basically lenore remembers being inlove with Annabel while Annabel remembers falling inlove with Lenore.

It's why Annabel is so hopelessly devoted and lenore isn't. Lenore remembers Annabel saying she wants her to have a better life even if she(Annabel) is forced into needlepoint. Annabel remembers the why

As much as I hate saying it; I think this is all because Annabel was more attached in life, that she loved lenore more than lenore loved her and it carried into Nevermore.