Did you try to discuss it with her? What was the criticism that made her withdraw?
My spouse did not process her feelings. She was a feelings stuffer. When times were good, there was enough positive love for her to get past the difficult times, mostly by expressing her own needs. When her needs were met, she would be less defensive. It did not resolve conflict though.
I grew up in a home with a father who was rather critical. He was the product of a home with much alcoholism. I suspect that at the core of his issues was a fear of abandonment. That may be my core issue as well.
The bottom line with criticism is that it is destructive. I was critical of her in many ways, but the hardest to reconcile related to how we were dealing with our health as we aged. I wished to reduce the processed foods in the house and to keep a commitment to exercise. Food is her comfort mechanism and exercise is something she just hates. That was not a problem in our youth, but at this point she is morbidly obese and diabetic. To further complicate matters, junk food is a weakness for me that I wish to keep out of the house. My father was a food addict and I watched what it did to the last 20 years of his life. I watched him become diabetic. I watched hiis knees and hips fail as he eventually spent all of his time in a chair. Obviously, this situation was no picnic for my mother.
I failed to love my wife unconditionally. I was partially because of my own childhood baggage. I suspect that her withdrawal was partially do to her difficulty embracing positive changes. She did not speak her negotiation of the relationship. She withdrew from the strong emotions that her feelings caused in her.