Hanna Irene.
As you've discovered, marriage is about compromise, effort and compromise. It's alos worth it. Really really worth it.
Firstly, your wife being talked to by her friends. I'm sorry, but this is something, even the best friends do, they are trying to create a victim, your wife. Happened to my wife as well and probably every wife. That it is bothering her is because she has some doubts.
Give you an example. A few years ago, my wife and I were trying to help a 16 year old niece, who was having some problems. We've known this kid since she was a baby and she has always been a bit special to us. Anyway, the niece takes to me more than my wife, mainly because I didn't try to tell her what to do. (The niece is on my wife's family. And not to put too fine a point on it, nature blessed her). My wife sided with her brother, the girl's father, naturally.
Then the chatter started. Middle aged man, pretty young girl. The implication was that my wife was letting all this happen because she was somehow inadequate.
Eventually, my wife came to her senses of course. But you can see what was happening? It wasn't that they were trying to hurt my wife. But if my wife had taken them seriously, they would have been there to pick up the pieces they had created.
We can laugh now, the idea of me going with a teenage girl.
Our wives friends somtimes do that. Not to harm, but because they have their own little clique which, frankly, doesn't include you or me.
Please don't get the idea that they are getting at you. They are just doing what they do. You wife just needs to get a bit of perspective back.
I strongly suspect that, once you've gotten over this hurdle, the other problems will not be so important.