Congratulations on your graduation
I can understand your frustration, but the part of this that I hope you will have and/or keep inner pride, you worked for what you got, you'll have a better grasp on life and the world beyond school.
On the otherhand your friend won't, and her struggle will begin big time, not being in touch with reality, school, work, and independency.
If you find her irritating, makes you miserable, remove yourself from that relationship, maybe even stay as distant friends?

I wish you lots of luck with this,

DE