to err is human...
we all do it.
But its never to lake to make it up to 
Moms...they are the most forgiving of gods 
creations.
I suggest a ladies day out of lunching and 
shopping....take in a movie...
all any mother really ever wants is to spend any 
time with her children.
You just got thru finals....and it takes days to 
recover....she'll know that too.