They just can't keep looking the other way while these public leaders who claim allegiance to the church so wantonly flaunt their disobedience to a fundamental teaching of the church of the Lord. If their words are to carry any moral weight, the leaders of the Church have to take a public stand and back their words with actions.
Pelosi herself put them in this position. Whatever action they take, they need to insure she understands the gravity of her sin. That in itself makes it a personal matter between herself and her Church. Perhaps we may never know what the results turn out to be.
Just to clarify the situation, the Catholic Church follows Scripture on these matters, specifically, 1 Corinthians 11:27-29.
As so many others have already pointed out, Pelosi may attend Mass where she will hear Scripture read but, like others in her mindless situation, might feel embarrased to not go up for communion. Hence, the Church views this as unworthy reception of communion. Specifically, a person who eats and drinks unworthily is guilty of profaning what is holy. In the above passage, St. Paul warns that "Whoever, therefore, eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of profaning the body and blood of the Lord." While we cannot reasonably expect that every Eucharistic Minister of Holy Communion can deny her communion (they have no way of knowing whether or not she repented of her sin), we do have the assurance that God knows. In essence, she excommunicates herself, 'latae sentiae' (by her own accord).