Bc39, Yeah, the timing is what doesn't feel right to me either.
It seems as though your wife, at least intellectually, understands that they chemical, emotional, high that she got from the OM is not mature love. What Accuray and Andrew Marshal describe as "loving attachment" pales in comparison to infatuation (what Mr. Marshall calls "limerance" and Accuray calls "in love"), and some WAS don't get that. When I say your wife is not "in love" with you, I speak not of infatuation (I agree with Accuray, you cannot expect that high to return in a long term marriage) but of loving attachment. It is the absence of loving attachment from a marriage that can make a spouse feel that there is no "love" in your marriage. A lack will also kill attraction.
If your gut has been serving you well to this point, then I would continue to trust it. We end up getting fine tuned into the WAS, and can tell when there is something amiss (we may not know what it is, just that something doesn't fit). If you are not feeling this way, then perhaps there are other reasons for her current change in behavior. You are in the best position to determine that, the community out here can only guide you based on what you write on these boards. I think your situation is being followed by some members with extremely keen insight, so in that regard you are lucky indeed.