The comment about porn tells us more about her then it does you. She is having insecurity issues about herself, her appearance, whether or not you still find her attractive, and possibly the decision for selling her nest which she will blame you for forever. Now these fears may or may not be valid, but that doesn’t matter. I would recommend that you let her know that she is still beautiful and that you love her (that you aren’t thinking about cheating on her which is how a lot of women interpret porn. ie you are interested in other women).
Also find one of those women that she just can’t stand that bought an expensive home in the last year or two. I’m sure you know the ones I’m talking about. Track the comparable sales in the neighborhood with your wife so she can see how much this person is losing. You can start out by saying look so and so bought their home for $X and their neighbor just went into foreclosure and had to sell for $Y. With any luck Y will be less than X. This will get her in the mind set that there is a declining market/economy and it will also help REAFFIRM her position for having sold a year ago.
As far as money goes you could start saving for a “romantic” trip. A little charm should get her talked into it easy enough and improve her happiness. If the S@#% hits the fan you could always use the cash to get by on (the re-appropriation of funds has to be her decision, you can have no part for obvious reasons.) If nothing hits the fan then you have some cash to travel to an exotic place with your wife. Embezzlement is also an option. Stash a $20 here $100 if she asks just tell her you spent it on porn or something (that may not be a good idea). Finally if nothing works you could always slip Prozac into her coffee. All is fair in love and war! This last paragraph I was just brain storming, but I think your wife feels uneasy right now with a lot of things. She needs to know that everything is going to be all right and that she made the right decisions. Women have lots of insecurities and need to constantly reaffirm their position. (Sorry girls, not trying to pick on you)