According to Catholic scholars, why was Blessed Virgin Mary spared of temptations on her way to motherhood?

We see that Blessed Virgin Mary had a rather smooth travel on her way to giving birth to Jesus, bar the physical hardship of travelling to Bethlehem towards the end of her pregnancy and trying to find a place to stay. She did not have to face any temptation say, the Devil threatening her that she would be abandoned by Joseph, and that Herod would send his men to kill her son etc. Jesus, on the other hand, was made to face temptations right at the beginning of his public mission. My question therefore is: **According to Catholic scholars, why was Blessed Virgin Mary spared of temptations on her way to motherhood?**