Ecumenical (cross-religious and cross-cultural) evangelisation is a special characteristic of the Russian Orthodox Church, especially the Russian Orthodox Church Outside of Russia. It has resulted in the founding of the entire Orthodox Church of Japan, the entire Orthodox Church of China, the entire Orthodox Christian mission to North America (up to 1917), the Western Rite outreach to America, Europe, Britain, and Down Under, missionary work in Haiti and South America and Africa, and now, Hanceville, Alabama. We pray that Mother Angelica and all schismatic persons will return to the bosom of the Catholic Church, the original apostolic Faith, which is preserved fully and lovingly only in the Eastern Orthodox Church. It was not their fault that Rome apostastised, and miracles are possible. And they are doubtless simply striving to love God the best they know how.
Matters of dogma are easy to parse, but I am not on a high horse. I have no doubt that Mother Angelica would easily enter the kingdom of heaven ahead of me with all my sins.