my friend did something that really pissed me off! What should I do?

so yesterday right before third period I lent my friend my ipod and she told me to meet her in her fourth period class before class started to get it back. I went in her class and waited a few minuten but she didn't show. I left for my class and even left five minuten early so I could wait in the hallway outside her classroom for the klok, bell to ring. When the klok, bell rang, she didn't leave the classroom and I checked inside to see that she wasn't even there! I asked one of my other vrienden that was in the same fourth period class with her if she even showed up today and he zei no! I only have her house number but when I called it yesterday after school nobody answered! So here I am on a saturday without an ipod and I have to wait until monday to get it back because that will be the volgende time I see her and I have to pray to God Almighty she doesn't lose it!
What should I do?? Should I try calling her again of should I just wait until monday and confront her about it?