There’s no ambiguity involved.
Mary is the mother of Jesus.
Jesus is God, the Second Person of the Trinity.
Mary is the mother of God, the Second Person of the Trinity.
When you say that Mary is the mother of Jesus do you mean in the biological sense? Or do you also mean that she is the mother of the divine nature? If so, it cannot mean that she's the mother in the sense of being before the divine nature the same way that all mothers are the progenitors of their offspring. It cannot mean that she is in a superior position than the divine Word since she is a creature and the Word, the Second Person of the Trinity, existed before her.
When you say the Jesus is God, the Second Person of the Trinity you are affirming that Jesus has a divine nature as well as a human nature, united in one person, Jesus.
However, if you are saying that Mary is the mother of the divine essence it is just as wrong as saying that Jesus is the Trinity.
Cordially,