Actually, she didn't have sinful flesh "like you and I."
She had sinless flesh "like Adam and Eve."
As Scripture says, Christ is the New Adam (1 Cor 15). Just as Adam received a perfect human nature, not a ruined one, so as "New Adam," Christ had a human nature which was also perfect.
Since Mary is Christ's ONLY human parent, they must have partaken of the same human nature, which is to say, one which was as "good" as human nature was originally, at the Creation.
Speculation on your part.