The Conjuring and Annabelle

I’m so confused. So in Annabelle, teenage Annabelle Higgins commits suicide and ends up in the doll. In the beginning of The Conjuring movie though, the two girls say that a little girl named Annabelle Higgins died in their apartment and they gave her permission to move into the doll.

So if she died as a little girl, how did she become a teenager and kill her family and herself?