Uni fees for international students are damn expensive. Perhaps get her to consider trying to get onto some sort of paid apprenticeship programme? Try to look for viable job options with her. Does she have any savings? She could study in Germany, where higher education is free and use her savings to live off.
Most of all just communicate how you're feeling with her OP.
If there's no viable way for the situation to change, ask yourself if you can get over this, or else you'll have to leave. My advice to help you cope is this: you say that her clients are using her as an object, but if you think about it from another angle she is also using her clients too, for money. She wouldn't sleep with these guys if not for the money, the sex with them is emotionless and empty. But when she's with you she feels things, because she loves you, right? Having someone's heart and soul is a lot more difficult and valuable than having their body, because then if you have problems in your life she will stand by you. And that devotion is something only you will get, not any of these other guys.
Good luck OP.