What kind of punishment does she deserve?

So for the next 2.5-3 moths my little sister(Dylan-she's 13)is living with me(I'm a 27 year old guy) because our parents are abroad and it past 2 weeks so yesterday I dropped her off for school like normal, and after her second period the principal calls me and tells me that she and a couple of her friends snuck out of school! And the cops are looking for them so he asked me to come to the school, that was probably the most humiliating thing that has ever happened to me! I had to leave my own job (I'm a high school principal) I was sitting in the office with two more parents, when they came into the office I could slap Dylan in the face! She wasn't expelled or anything but she does have detention for the next two weeks! When we got into the car I told her that she will receive her punishment at home! When we got home I took all of her Electronics away (iPhone,laptop,iPod, iPad and I even took the TV off the wall) and I am still not satisfied I don't know how else to punish her! One of my friends told me to spank her but I am against that! I think that a kid will NOT learn their lesson if you will beat their *** up! So I called my parents and I told them what is going on and they told me that I am the adult now and I need to decide what punishment should I give Dylan but I really don't know what punishment should I give her it has to be pretty bad! I want a punishment that will show her that I'm not a person to mess with!

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