Last time Mary Lennox was in the bar, she received some
very unpleasant news. And when she walks in today, her face is sharper and colder than it's been in weeks or even months.
She doesn't look like she wants to be there. But if she doesn't come to Milliways, Bran can't find her so she can explain what she's done.
(And anyways, sitting in her room and scowling at the walls isn't helping to sort out the whole confusing thing as much as one would expect.)