These and many other texts speak in varied ways of Mary as Mediatrix of all graces, so often that the teaching has become infallible.
Thank you for providing this information. It illustrates my point that not every statement from a Catholic is Sacred Tradition. As much as Fr. Most would like, all of the texts that he referenced taken together do not represent infallibility. Mary as Mediatrix of all graces is not a dogma of the Church and there does not appear to be a great desire by the Vatican to make it dogma.
You do understand this in from a catholic website....right?