The line “lead us not unto temptation” implies that while God doesn’t provide temptation, it is certainly within the power of God to preserve us from any temptation that doesn’t arise from our own will, or that we might respond to particularly poorly. The truth is the Mary might have been less preserved from temptation than we are because she was so utterly preserved from taking the devil’s lies at face value.
Mary was so surrounded by grace that she was not tempted in the same way that we are. If you think back to periods of grace in which previously attractive sins seemed disgusting–that is, when they are not surrounded by false glamour, but seem like what they are–then you know what I mean. OTOH, she may have been subjected to the torments of the Liar and Accuser ("…if you are the Son of God…") who tormented Her Son.
Like Jesus, Mary was subjected to the pains of her choice to follow the will of God. Her heart was pierced by a sword, as foretold. Although she rightly gave all glory to God in her Magnificat, in no way did Mary “get off easy”. She had to say an unequivocal “Yes!” to every grace God offered her in order to remain as He made her. As her Magnificat also says, it was her great joy to do so.
In any case, Jesus didn’t buy into the lies that we know he was subjected to. Mary would not have. We, who at heart want to decide good and evil for ourselves, sometimes do.
If we look at temptation in our own lives, and start weighing “pros” and “cons”, we are not being tempted differently than Jesus or Mary. We are responding to temptation differently than they did. That is our choice, too, and it is a big difference.