I went through her e-mail this morning and (as expected) all of the e-mails between her and the OM were gone. I did turn up one that raised some questions (she'd sent her phone number to a guy she'd met on the last cruise). She didn't get upset that I'd dug into her emails, got a little bit defensive about it (nothing happened, they were with his brothers almost the whole time, he was 8 years younger than her and she doesn't like younger guys), but ultimately answered all my questions.
I'm still skeptical about whether she's just saying what I want to hear, but she's at least acting more consistently with what I was hoping for.