She actually approves of the ''settle down with kids'' answer more (by one point exactly lol). At least according to the datamined dialogue
Can tell for a fact that the game doesn't give the "Karlach approves" notification there, which is just mean in this case ahah
Perhaps a bug (or, if probably giving too much credit, a feature of where you aren't supposed to know she quietly liked the idea)
Ah well I'm not regretting picking the softer optimistic version either way.
To be fair i've found the " X approves/disapproves" popups to be very fickle in some specific conversations, you still get the approval/disapproval but the popup sometimes just doesn't show up/shows for a split second/shows without the correlated character portrait, at least in my experience