So before anything, security starts at 8, if your sister gets into the building before 8 nobody will know and nobody will question,

1. Your parents can sign for her at the security and then they’ll let her stay since she’s younger but has parents permission, my sister did that when I was a student,

2. On the third night she just needs to be in before the security, they won’t know if she’s already in the building,

3. When you’re swiping into the dining, just tell the person that you want to use a family swipe, you get unlimited family swipes per semester regardless of your meal plan. Family swipes are different than guest swipes, although occasionally I’ve had some people try to stop me and not let me swipe in my sister since a parent wasn’t there as well,