Propagandized Church History is a fact of life. They are so ingrained now that even presenting the facts is unlikely to change someone’s mind, you just get accused of being an apologist.
The reason why the Council talked about Mary was because it was held to judge the orthodoxy of Nestorius who refused to call Mary the “Theotokos” and instead called her the “Chrisotokos” due to an over-zealos distinction between Christ and God. This is attested in all the documents pertaining the Council.
As for the idea that the Council “elevated” Mary that also is false. Yes, the Council officially anathemised those who refused to recognise her as “Theotokos” (the Nestorians) however all evidence shows that christians have been using the title since the 3rd Centuary (which is why Nestorianism was condemned). Also note that although the Nestorians refuse to call her “Theotokos” they still ask for her intercession and hold her in high esteem. The Assyrian Church also rejects the title however a mere glance at their liturgy and prayers shows that they venerate Mary just as the EO does.
google.com/url?q=http://www.nestorian.org/nestorian_theology.html&sa=U&ei=XzJnT8u9B6L30gHeuNjUBA&ved=0CBAQFjAA&sig2=90v4Adnn9oQMyQqeboo0dw&usg=AFQjCNG3ZFUNftUM2AP7qpQea03c18MkKw
The modern Assyrian Church of the East has shunned the “Nestorian” label. The church’s present head, Catholicos-Patriarch Mar Dinkha IV, explicitly rejected the term on the occasion of his consecration in 1976,
But “Saint Nestorius” , no, in good standing, and possibly misunderstood in his work on Christ is still in question and not accepted. Theodoret of Cyrrhus, finally agreed to anathematize him in 451 (during the Council of Chalcedon); from then on he had no defenders within the empire. But the Church of the East (that is, the Church in eastern Mesopotamia and Persia, under Sassanian rule) never accepted his condemnation.
This led later to western Christians giving the name the ‘Nestorian Church’ to the Church of the East (the modern Assyrian Church of the East), even though it never regarded him as an authoritative teacher. The discovery and publication of his 'Book [or Bazaar] of Heraclides at the beginning of the 20th century led to a reassessment of his theology in western scholarship. It is now generally agreed that his intentions were orthodox, but the adequacy of his formulation of the doctrine of Christ is still controversial.
2001 “Guidelines for Admission to the Eucharist between the Chaldean Church and the Assyrian Church of the East” allows Assyrians and Chaldeans to accept the Eucharist from one another. The prior year, Assyrians and Roman Catholics also produced “A Common Statement on Sacramental Life” that assessed the importance of sacraments in both churches. Assyrians have also been allowed to study at Baghdad’s Chaldean Catholic College and unmarried deacons and priests can study at Catholic universities in Rome
Theotokos has been a non-issue is all the church’s now and is venerated in Hymns in all the Churchs now.