It depends on a number of things. Are you committed to keeping the cat for its lifetime, meaning after university? Can you give it the daily care it needs - fresh food and water, litterbox, toys , vaccinations, other vet care? You also must ask about the rules concerning pets in the dormitory. It's sad that the cat is a stray, but sadder to be dumped after having a home. Please consider asking others if they will take the cat and give her a permanent home.