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If she was truly the 'stern but fair' schoolmarm she was supposed to be - although, truth to tell, I find that rather hard to swallow since the biggist bullies of the school (Marauders, Twins) thrive under her watch - the Marauders strapazes should've been a thorn in her side.
You know, someone gave James and Sirius all those detentions that got them to use the mirrors and made James unacceptable as prefect. I don't think that someone was Horace Slughorn. It is possible Minerva did try to keep them under control but failed miserably. And then James appeared to have cleaned up somewhere in 6th year (most likely he simply had better ways to cover his tracks, with the map and possibly Peter keeping lookout in rat form), and it seemed like her hard work finally paid off. So when the twins came along she patiently stuck to the same methods.
You know, someone gave James and Sirius all those detentions that got them to use the mirrors and made James unacceptable as prefect. I don't think that someone was Horace Slughorn. It is possible Minerva did try to keep them under control but failed miserably. And then James appeared to have cleaned up somewhere in 6th year (most likely he simply had better ways to cover his tracks, with the map and possibly Peter keeping lookout in rat form), and it seemed like her hard work finally paid off. So when the twins came along she patiently stuck to the same methods.