Everything about the ‘rona has been contradictory and illogical, but, yeah, we noticed that about the letter.
She will not leave the Church. She figures so far it is just this one totalitarian head of this group. Hopefully, they lose about 20% of their volunteers.
She should take the letter to the head or heads of this church. If they do nothing to stop the controlling actions laid out in the letter, then the church itself sanctions the letter and group leader.
A good Pastor knows or at least wants to know what is being done using the name of his Church.
His actions will be revealing.