What do you think happened to the lady they freed from the pool in book one? I always headcanoned that she became the crazy lady in mm1
Similar, but I headcanon that she becomes Crazy Helen in #14. Okay, fine, Cassie doesn't mention recognizing Crazy Helen as the woman she carried to safety during their first mission. But it was dark in there, Cassie had horse eyes, there was a lot else going on. And it is strongly implied that Crazy Helen is an escaped yeerk host.
Honestly, I like the headcanon that the shoe lady from MM1 was a controller whose yeerk died as a direct result of Rachel destroying the kandrona and the subsequent mass starvation. Mostly because I'm a big fan of the dramatic irony in Rachel having changed this woman's life and neither of them knowing it at the time.