A surprisingly realistic ending to Mk1.
She doesn't understand, he doesn't have the ability to explain it to her, because there's an inherent contradiction in humanity there. She is self aware but can't do anything about it because she doesn't have human rights... and the adults don't care, they just want results.
The fact that there's a Mk2 is surprising, however. I thought at the last minute he'd ask them to let her stay or something similar.