She wasn't trying to justify her actions, just explain them. She looks up when Kate moves, and watches her walk to the bathroom without making any comment. There's no point trying to stop Kate, that'll only make things worse.

Instead, she curls up even more, her knees up to her chest and her arms wrapped around them as she sips at the coffee Kate bought her and waits. She wonders if she should have tried to keep it secret, but knows, rationally, that it would've come out sooner or later and would've been worse then. Steph just hopes this doesn't ruin their friendship completely.