Your wife has gone from being just a mother and a dutiful wife to working and trying to have her own career. Her perspective on things have changed and that is normal when it comes to getting out there in the world and experiencing other people and things outside one's own environment.

I have a feeling that for a long time her life was about you and the children and getting into a life routine about that. Well, if a person steps away from that daily pattern, it will change them gradually. Family life has changed a lot where women are encouraged to be more than just a wife and mother. Couples are different now in that in a high percentage of households both husband and wife have careers of their own.