Her article is a master-class of what the Fathers of Vatican II referred to as the lay apostolate. This was not invented in the 1960s; before then there was a thriving lay apostolate in the Church. Unfortunately, for various reasons, it was, to a large degree, emasculated after the council, in favour of lay ministry.
The difference is this: as a priest, I can distribute Holy Communion, I can read out the scriptures, I can celebrate the Liturgy. If lay people do these things, they are essentially helping the priest.
As a priest, I cannot campaign in a trade union for the social teaching of the Church, I cannot gather employees of a bank to say the Rosary during the coffee break, I cannot run a business that gives its employees decent conditions of work. Only lay people can do those things - and there would be many more (and probably better) examples to lengthen the list.
And I cannot tell a mother from experience, about the joys and trials of bringing up children - only a lay woman can do that. As Pope Benedict said (to the Scottish Bishops on their 2010 ad limina visit):
Hand in hand with a proper appreciation of the priest's role is a correct understanding of the specific vocation of the laity. Sometimes a tendency to confuse lay apostolate with lay ministry has led to an inward-looking concept of their ecclesial role. Yet the Second Vatican Council's vision is that wherever the lay faithful live out their baptismal vocation – in the family, at home, at work – they are actively participating in the Church's mission to sanctify the world. A renewed focus on lay apostolate will help to clarify the roles of clergy and laity and so give a strong impetus to the task of evangelizing society.Simcha Fisher has given a fine example of the lay apostolate that Pope Benedict was encouraging.