A student in my college course needs computer accommodations for test taking. Doesn't this give her an unfair advantage over other students?

If the student has a documented disability, is registered with the campus disabled student services office, and requires the adaptive technology to access the test, using a computer is an accommodation not an advantage. The student and disabled student services staff can work with you to assist with setting up the test accommodations, determining the test location, and providing a test proctor if needed.