She'd still be 18 or 19 at this point. Developmentally (both mentally and physically) she's more like 14-15, though, and of course obsessively fixated on him to a degree far beyond that of a normal child for a parent.
Babs seems to have no comment or even interest beyond that question in that one panel there, as well. I really don't even have the beginning of a clue wtf Horrocks was thinking or trying to say there.