Well, if you don't wanna let her know you've been reading her
blog, start a study group and include her... casually tell her
you're starting a group, and try to get her to join.
She might feel less stressful in a study group if there're people
who can help with her studies. Besides, studying in a group helps
to motivate her a little more, and encourage her, and takes her
mind off the inadequacy she feels.