He doesn't know that he believes her, and he raises his eyebrows so she knows it, but Eames lets it go. He can't make her tell him, not in any way that he's willing to employ, and he decided a little while ago that he won't force Nancy to do anything if he can help it. Even if he's fairly certain there's a number of choices he'd make on her behalf that'd improve things for her significantly. Blah blah blah she's her own person, blah making her own mistakes etc. etc.

Caring is so inconvenient.

"You've got good instincts." It's when her feelings get involved that things seem to get messy for her, but as far as he can tell Nancy's gut is pretty spot on most of the time. "If something doesn't feel right, don't do it."