Thanks for helping your sister! Colleges are still having their club activities, even if they are all virtual. usually a school will have an online listing of clubs and activities. If she is in a dorm, her dorm or her dorm floor maybe having activities as well. She should definitely try that, and remember that many of her peers are feeling the same way…wanting to meet people but unsure how. She could ask someone on her floor to have lunch together, ask a classmate to study together, even check in with her RA who might be able to loop her into some activities or groups.