Board Thread:Manga/@comment-26495049-20161106042532/@comment-38526913-20190215001928

Ymir's dead though, so I doubt she's Ymir Fritz.

I don't think there's any reincarnation and that we'll see Ymir Fritz when Eren gets her memories (which he might already have, since we don't have his POV). We should get a flashback chapter showing how she got the power of the titans and how the curse of Ymir started.

There's also the chance that Historia's baby will be Ymir Fritz, if we believe in the time loop theory, which I'm not a fan of but can see happening.