I think you need to read more Saint Cyril Of Jeruslem ,Dear Friend
From Cyril of Jerusalem, Homily on the Dormition...
http://www.uoregon.edu/~sshoemak/texts/coptic/Cyril.htm
Excerpts...
"This is the day of the Holy Offering, which is wholly pure in soul and spirit. This is the day wherein the Queen, the mother of the King of Life, tasted death like every other human being, because she was flesh and blood."
This clearly supports Mary Queen Of heaven!
More...
Behold, when they see her they shall praise her through God the Father. All the virgins who are in the heavens shall rejoice with thee when thou shalt meet them, and those who have preserved their virginity shall come forth to thee, and shall bow in homage before thee, saying, Well hast thou come (i.e. Welcome)! O mother of all virgins! It was time for thee to come unto us, O thou mother!
And let us send up to her thanksgiving, saying, 'Remember us, O true Queen, and do thou plead on our behalf before God, so that He may shew mercy unto us and so that me may celebrate a festival to Him at all times.' Let us give alms to the poor in the name of the Virgin, [so that] she may not forsake us in the place to which we are going. Let us ascribe glory unto her by the utterances of our lips, and let us say, 'Through thee honours have been bestowed upon the city by our God.' And again, 'The death of the saints is precious in the sight of the Lord.' (Ps 116.15) And again, 'The sound of rejoicing and salvation is in the habitation of the righteous.' (Ps 118.15) And now the time hath arrived for us to offer up the Holy Offering, the Body and Blood of Jesus the Christ, our Lord, and moderation in everything is good. By the Will of God we will give the remainder of the exegesis in the holy shrine.
You realize that this text is a pseudograph, right?
"This is the day of the Holy Offering, which is wholly pure in soul and spirit. This is the day wherein the Queen, the mother of the King of Life, tasted death like every other human being, because she was flesh and blood."
Yes, it certainly appears Cyril held to some form of Marian doctine.
It also appears that the assumption was not part of what he believed.