Do not confront her, especially when you are upset about it. She has finished the class (likely has left the school entirely if it's a short-course language school). Your relationship with her is over. It is simply not appropriate for a teacher to pursue a student demanding an explanation of her review of you: feedback should be mediated by the school.
Unfortunately, the review itself does not contain any information you can act on. "Does not know anything about teaching" is probably intended as an exaggeration for emphasis. None of your other students formed this opinion. No doubt your employers think otherwise or they would not have employed you. If they want to request that the student give further details about her unusual opinion, and perhaps ask whether she would like to make a more formal and detailed complaint about your teaching, then they can do so (and if she wants to she can say no). That's not so bad as you chasing the student down on your own to complain about her opinions, demand more information, or try to persuade her to admit that she's wrong.
their unfair system of evaluation at the end of each session will definitely have effects on my payment
Then your dispute is with the employer, not with the student. If they unfairly deduct your pay as a matter of rote, and not based on their own fairly-conducted assessment of your teaching, then they are the problem.
if it continues like this, I will no longer be able to continue teaching there.
Perhaps so. If the school is using negative reviews as an excuse to short-change you, rather than as a means to get detailed information to use to improve your teaching (and hence also theirs), then perhaps you are much better off without them. But you should be looking to the school to improve its processes, not looking to the students to help you avoid the consequences of its poor processes.