I guess, though, it means they're no longer seeing her as a child.

Well, Jane clearly isn't. For several quite legitimate reasons, her father is not in a position to do anything about it.

"...I'd suggest you move into a larger space.

It's not as bad as all that, fortunately. As Toronto apartments go, I we have a pretty big one. The bedroom is substantial, the common area is larger and there is also an office so - as right this minute, for instance - Laura can work in her our room while I "work" in my our office.

Over the long run, though, we will want more room.