You call your mother, and tell her that you hate to reschedule, but you already cancelled on Brennan once recently, and you'd hate to cancel twice. She forces an "it's fine". She then explains that she'll be A-okay staying home alone tonight watching a movie, and that she may as well return the nice dress she bought, because she's pretty busy for the rest of the month, and would love to see you, but just isn't sure she has the time. She meaningfully, though downtrodden, tells you to have fun with Brennan and reminds you to call her soon. You seem to forget to a lot.
Continue.