Why the cheap shot on 25? That wasn't necessary. Shame on you.
Look, your wife is not believing anything you say. Why should she? Get the house professionally appraised like my bank did. I am glad I did because my buddy the real estate guy was roughly 10K too high. Because the bank had a professional do it, my W believes it.
So, have your W pick out an appraiser that you both agree on. That way there is no reason not to accept the findings.
Quit trying to explain your side. We all get it.
It gets to a point where "The man doth protest too much, methinks."
“Things turn out best for the people who make the best out of the way things turn out” ― Art Linkletter