<human>: Can you give me the gist of the text in a nutshell?

We recently moved in together and it has been working out fine except this part. She is a student who is student teaching about 8 hours per day. 

The thing is all of my student friends are able to pay rent. She doesn't have the best job, but she tends to sit around a lot and sleeps 13 hours per day sometimes.

She basically comes to tell me that every single paycheck is going straight to me for rent, and she isn't really able to afford it. 

The apartment is $850 per month. My work pays for 300 of it and I pay 400 on top of that, with her $150 contribution.

Am I being unreasonable in asking her to come up with it despite her complaints of not being able to work? I've been clear that I expect the same amount from her regardless of her student situation. How should I go about telling her this is important?
<bot>: GF can barely pay minimal rent, I am upset, and it almost seems like she is taking advantage of me by saying she doesn't have enough money.