Original Commentary
Things have changed... Brisbane has gone from sleeping in her bathroom to an actual bed.

Modern Commentary
That's one of the things that I don't think we went into too deeply, but...throughout the series, Brisbane makes a number of friends. Kimberly does not. This is mostly because Brisbane puts the work in and Kimberly doesn't.
One of the reasons that Emily is able to keep getting back into Kimberly's life is that Kimberly never really made other friends. - Terrence

We tried to give her a pet, but that didn't take.- Isabel