Well. At least she didn't tell him verbatim what Lambert told her. Then he'd really be mad.

"...You shouldn't?" she asks, crossing her arms, curious. "I'm not going to tell anyone," she also insists to Childermass's turned back, deeply concerned now that she fucked up somehow. "I mean... I guessed. He just confirmed it. And I get it, wanting to keep things more private-- Amethyst doesn't really like me talking openly about... Us. Either."