Your wife became Catholic at her Baptism. She was required by Canon Law to marry in the Church or receive a dispensation to marry outside of the Church. If she did not receive dispensation or marry in the Church her marriage is not valid due to Lack of Form and your marriage needs to be convalidated.
The previous poster was correct. This should have been addressed in RCIA when the director was told your wife was Baptized in the Church as an infant and was therefore already a Catholic at the time of her marriage to you which took place outside of the Church.
"The law of the Church requires for validity that every Catholic marry in the presence of a priest or deacon and two witnesses, using the Catholic form of marriage. It is possible for the Bishop to dispense from the requirement of canonical form for the Catholic party entering a mixed religion marriage. The marriage of two Catholics always requires canonical form.
If a Catholic is not married in the presence of a priest or deacon and has not received a dispensation from canonical form, then the Church’s required form of marriage has not been followed and the Church does not recognize the union as a valid marriage.
For example, if a Catholic and non-Catholic marry in a non-Catholic religious ceremony without the Catholic first receiving a dispensation from form from his/her bishop, they have not observed the required canonical form. Similarly, if two Catholics marry in a civil ceremony they have not observed the required canonical form. Their unions are not recognized as valid marriages by the Catholic Church."