Crowley does all the explaining, which means Alice doesn't have to say a thing. It's true, after all - it's just teasing. Alice doesn't doubt even for a moment just how much her parents care about her.

.. nor does she doubt how amusing it is to see her mother trying to have some sort of negotiation going on about what's going to be on TV. Alice herself honestly doesn't care, not being too picky about these things, so she just stares on in amusement at them as she waits for Aziraphale to answer.