What Pelosi has done here falls into what we learned in RCIA as the category of the "M" sin, one that places her soul in grave danger of condemnation. It is a category of wrongdoing that is close to the ultimate because it has the potential for leading others astray, thereby placing their souls in mortal peril. As a an elected leader and public official who claims membership in the Church, Pelosi (and others) have a special obligation to not oppose what is a clear and unambigous position of the Church in so public and visible a manner.
She can regain standing to accept communion in a worthy manner by confessing and repenting her sin, which is what the sacrament of confession offers. But until then the leaders of the Church have no choice but to publicly repudiate her false statements so as to make clear to those who might be swayed what the teaching of the Church is on this matter.
I appreciate your detailed response. Does this mean then that she now cannot receive Communion until she repents her actions? Who adjudicates this? Her priest? I'm not Catholic so the workings of this are unclear to me.