Agree with Lissie. When parents start getting involved it is actually a negative. Also, getting badgered into going to some marriage retreat isn't going to work out that well. If she wanted to save the marriage she would be trying stuff like that. It would be preferable to avoid tipping your hand to your wife's parents or having them intervene on your behalf.
In the end, it's not the years in your life that count. It's the life in your years. Abraham Lincoln
It is hard to fail, but it is worse never to have tried to succeed. Theodore Roosevelt