It could be that she doesn’t realize that Brendan is essentially her second parent, and not just Al’s friend who was continuing Al’s work.

She seems to partically believe that Lucille played a role in her “conception” when in reality it was Brendan and Al together and Lucille was just the doctor who helped transition her from robot to himan and then later male to female.

Or more so like a doctor in some cases.

Especially knowing what we do now, Sulla was essentially “concieved” by Brendan with Al as the “donor”, if you will.

Lucille wasn’t needed to create her, but when Sulla wanted to transition (from robot to human and then male to female) then she was needed to help make that change, which is important too.

This begs the question: Does Sulla fully know the context of Brendan’s and Al’s relationship? To me I say it’s implying that she does know at least some part.

Whether or not she was involved, Sulla lives mostly at home and is brilliant, and has surely noticed the purported string of attempts at recreating Al. No wonder she was thrilled when Brendan accepted one of them.

I love that the best hope for reconciling Al and Brendan is the accidental offspring of their psyches. Brendan poured enough love and little enough impatience into raising Sulla that she can give Al something he’s never had.