Do people who adhere to the Immaculate Conception of Mary believe that Mary and Jesus were both conceived in the same fashion? My Christian training emphasized the uniqueness of the Christ as the only human ever directly created since Adam,thus the only one ever born of woman that could offer a propitiatory sacrifice that would exactly cover the fall of Adam.

Catholics and some Protestants regard Mary as having had a similar special conception that left her perfect to be the mother of God.

My question is if Jesus had to have a perfect mother to be perfect, would not Mary also have had to have a perfect mother to be born perfect?

And her mother  the same and her mothers mother the same and her mothers mothers mother the same etc....    

Would it not make much more sense to conclude that just once in all history the Creator of Adam created another perfect human by miraculously adding the necessary spark that initiated  the process known as fetal development from the ovum of Mary?
No, they do not. Jesus was born without sin by virtue of being God. Mary, who was conceived in the usual way, would have had to have some other approach to be sinless. After some thought about how that might have occurred, theologians concluded that

the soul of the Blessed Virgin, in its creation and infusion into the body, was endowed with the grace of the Holy Spirit and preserved from original sin.

(Apostolic Constitution &quot;Sollicitudo Omnium Ecclesiarum&quot;, Alexander VIII,  1661; quoted in &quot;Ineffabilis Deus&quot;, Pius IX, 1854)
In particular,  the Catechism states:

Through the centuries the Church has become ever more aware that Mary, “full of grace” through God, was redeemed from the moment of her conception. That is what the dogma of the Immaculate Conception confesses, as Pope Pius IX proclaimed in 1854:

The most Blessed Virgin Mary was, from the first moment of her conception, by a singular grace and privilege of almighty God and by virtue of the merits of Jesus Christ, Savior of the human race, preserved immune from all stain of original sin.


(Catechism of the Catholic Church, paragraph 491)
That is, essentially, Mary was redeemed, sanctified, and justified (as we all are at baptism) in the moment of her conception, by the merits of her Son's sacrifice extended back in time. There was no need for her to be born of a sinless mother. It was the supreme glory of the Divinity that made it appropriate for Mary herself to be sinless, but she herself didn't have to be born of a sinless one to become that way.