I hope the guys extremely rich or I don't get it. My advice is trying honesty for a change. If she can't be open about her conflicted feelings with this guy, it doesn't seem like such a great relationship. I guarantee that being honest will be better for her in the long run. Either he goes, "wow that's great/freaky but I'm here for you" or he leaves her. In both cases she's the winner. If it turns out that he doesn't back her up when she needs it the most, her relationship wasn't anything to keep alive anyway. But maybe a relationship based on honesty and love isn't what she wants from life.

To sum up. If her husband is in on it and knows what she's up to, then all these worries about being traceable are irrelevant.