I am currently 58. I semi-retired 2 1/2 years ago. I don't have a pension. But, I calculate that between the part time work that I did last year and the part time work I will do this year it will equate to us having about another $4k a year from then on. I guess I must feel it is worth it since I'm doing it.
As time goes on, I do think more about whether it is worth it and for how long. Things that I consider. How onerous is the work and how much do I want that extra money.
For us - the extra money would be nice but would provide extras not essentials. But those extras would be nice to have. However, I do have the benefit that only work 1 or 2 days a week, the work I'm doing is the parts of my job that always liked (the semi-retire part of it all means I get to pick and choose the type of work I want to do). As I continue on, my BS tolerance is very low. That is, at this point, any significant annoyance would cause me to quit. So far - that hasn't happened and so I keep on. However, I am pretty much willing to quit at any minute if things were to change....
What I don't know in your wife's situation is how need (or desire) for the money balances out versus whatever is onerous about working....