Girlfriend doesn't care

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So I've been with my girlfriend for more than 2 years now, she's turning 18 this year, and everything seems perfect until we bring up the "first finish the school" subject. I don't want to ask for much since she has been diagnosed with depression the last year, and she is taking so many fucking drugs that is starting to annoy me how much sleep she needs, because of the pills. But my main issue with her is that she doesn't seem to understand how important is for me that she finish school, and she seems like she doesn't care. So, what should I do, how do I tell her to get fucking real with her studies without making her feel like shit?

Ps: sorry for bad spelling I haven't written in English for half a year