In 1994, the Congregation for Divine Worship issued a letter officially specifying that it is licit for females to serve the altar in the role that has traditionally been known as “altar boy.” Bishops were not bound to permit the practice, and a 2001 follow-up specified that pastors may also choose to reserve altar service to males within their own parishes. Nevertheless, the Church has specified that altar girls can exist within the Church.
The practice is permitted. That doesn’t mean it’s a good idea.
The throw-down the mic paragraph:
Beyond the vocations issue, we come to a more thorny problem. When men
are in charge of liturgy, they generally favor austerity, solemnity and
reverence. They are far more likely to have “high” liturgical
sensibilities. When women claim a more central role, we frequently see a
slide into lower and more culturally idiosyncratic practices. It
generally starts with campy banners and popular-style hymnody, but may
end with synthesizers and scantily-clad liturgical dancers. These
liturgies are not beautiful or uplifting. They’re more like a
never-ending hug from a grasping, obsequious aunt.
Read the whole thing!