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I am also Catholic, and i have never heard of this being done.  She may have asked, but I doubt if they would have done anything about it.  I know when you start Pre Cana, they will get a copy of his baptism certificate.  This is done by calling the church where he was baptised.  This certificate carries all the records for that person.  For example, First Communion and Confirmation.  This certificate will tell you what you need to know.  

@Lorsee:  No.   Baptism is for life.   That said, just as we can invalidly marry, we can be invalidly baptised. 

You stated that a marriage can be annullled.  Its important to understand that an annulllment rules that the marriage was invalid.  It does not undo the marriage.  It states that something was lacking at the time of the wedding that rendered the attempt at marrying invalid.

There can be cases where people have been invalidly baptized.  The Church requires people to be baptized either through pouring water over the head or by emersion.  Baptisms are considered invalid if someone merely sprinkles you with water.  Also, a person can't be baptised with a substance other than water (it seems people have actually attempted this).  We also baptise people in the name of the father, son and holy spirit. 

This is important when it comes to the fact that we recognize the validity of baptisms occuring among other Christian groups.  When non-Catholic Christian seeks to convert to Catholicism, if he was validly baptised in his previous place of worship, he will only receive his first Holy Communion and confirmation at the Easter Vigil Mass where he will come into full communion with the Church.  If he was not validly baptised, than he'll receive all 3 sacraments of initiation at the Easter Vigil. 

Once a catholic, always a catholic is what I have heard from a priest. Even if you convert to another religion or become an athiest, you cant cleanse yourself from the catholic baptism.

@eagle:  You need to read your own links. 

"the fact of this formal act was to be noted in the register of the person's baptism. This annotation, like other annotations in the baptismal register, such as those of marriage or ordination, was unrelated to the fact of the baptism: it was not a "debaptism" (a term sometimes used journalistically): the fact of having been baptized remained a fact, and the Catholic Church holds that baptism marks a person with a seal or character that "is an ontological and permanent bond which is not lost by reason of any act or fact of defection"."

It's also no longer possible to do this:

"

The motu proprio Omnium in mentem of 26 October 2009 removed from the canons in question all reference to an act of formal defection from the Catholic Church.[5][6][7] Accordingly, "it is no longer appropriate to enter attempts at formal defection in the sacramental records since this juridic action is now abolished. "[8]

In late August 2010, the Holy See confirmed that it was no longer possible to defect formally from the Catholic Church.[9] However, the Roman Catholic Archdiocese of Dublin declared on 12 October 2010 that it intended to keep a register of those who expressed the wish to defect.[9][10] Since this fell short of making an annotation in the baptismal register, CountMeOut, an association in the archdiocese that had been promoting formal defections from the Catholic Church thereupon ceased to provide defection forms.[11][12]

Although the act of "formal defection" from the Catholic Church has thus been abolished, "public defection" from the Catholic faith or from the communion of the Church is of course possible, as is expressly recognized in the Code of Canon Law.[13] Even private defection is subject to the automatic spiritual penalty of excommunication laid down in canon 1364 of the Code of Canon Law."

"I confess ONE baptism for the forgiveness of sins"-Nicene Creed