Mary was conceived w/o Original Sin because Jesus could not be conceived into an imperfect womb. Therefore w/o Original Sin, Mary was not subject to concupiscence (misspelled probably) and so she never committed sins.
Where did you learn all these strange things young fella?
Do you happen to own a Bible, or know someone who does?
JH :-)
Please answer these three questions...
(1) was Mary born without Original Sin...
(2) therefore was she born without concupiscense...
(3) how could she commit sin?