Girlfriend won't give me space during my exams?

I'm a grad student, currently writing finals.

When i tell her I need to study she gets all defensive and sad, and makes me feel bad for having to do my course work.
When I do go over to "study' she isn't very considerate of it; talks not stop, plays shows, pulls me from my laptop.

What does this tell me about her in the future?
I only have a week of finals left, but it's really hard to focus feeling like I'm disappointing her
Girlfriend won't give me space during my exams?
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