Let's talk Maeve being awake....
Maybe this is a dumb question, but if Maeve was following her programming, and that programming was telling her to go "infiltrate the mainland" then what exactly was being exported? Certainly not a sentient host. If anything, it was her sentience that prevented her from "infiltrating the mainland." So did someone just want a host out in the world that could be controlled for some purpose? Doesn't seem like Ford's MO.
Also, let's talk for a minute about cornerstone memories. Arnold's son actually died, right? Ford said that Arnold's grief made him adopt Delores as his surrogate daughter and drove him to wanting consciousness for the hosts. Ford then said that the grief he suffered at Arnold's death was the memory that drove him to wanting the same. Ford gave Bernard Arnold's cornerstone memory, and ultimately it was him rejecting it that made him realize he was a robot. It seems like then that the cornerstone memory has to be unique to the person/host for it to have any effect on a being's development.
Now, on the subject of Maeve, she seemingly rejected her cornerstone memory when talking with Felix in the elevator because she understood that the girl wasn't her real daughter. However, the suffering she felt at the loss of the child, hers or otherwise, was an actual event that happened in the park, or real suffering. It was her memory of that event that became her cornerstone, not the loss of an actual daughter but the pain of losing who she believed was her daughter. That became clear to her on the train looking at the mother, and whether the child was biologically hers was of no consequence any longer. That's why she was able to break code.
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Other items of note re: cornerstone memories.
Teddy's cornerstone seems to be killing the town with Delores and the fear associated with not understanding, then being murdered by Delores.
Interestingly, William's cornerstone that "woke him" certainly seems to be the suffering associated with confronting Delores as a robot with a wiped mind when he finally found her in town.
What is Delores' cornerstone?