Once they used up their credit, it will be going down hill since. When they start to see persistent weight gain on their tummy and thigh, it will be a signal for them to use other form of self sufficient mechanism like "we are modern women who need no men to lead a meaningful life style". You will know that they are in a little panic mode. At this stage, they are still ok. Still can go out with some guys.
After a while, their hair start to thin out. Face begin to feel dry and crow feet start to appear around their eyes. Their mood swing persist.
A woman's greatest asset in a marriage are her maternal instincts and traits. Her main roles are that of a wife and mother. If she can earn an income, it is an added advantage to the family and herself as well.