A naked girl got into my bed last night and I don't know who she is

I went to a frat party last night and had a few drinks. So did my girlfriend. Neither of us were sober enough to drive so she slept in her car and I went back to my dorm. I fell asleep pretty quickly. Woke up this morning to a girl in my bed. She was naked and I don't remember her coming over. I looked at her phone and saw that she had 73 texts from my girlfriend. I saw the first text my girlfriend sent her which was "did you get there okay?" and saw her last text which was "get out of my boyfriends bed NOW". I saw what I think was her mom's texts and saw the girl's texts to her friends and I'm still confused. I woke her up and asked her who she was. All she said was "oh shit" and she called an uber and left. I still don't know who she is and I'm not sure I want to. My girlfriend said she was just going to sleep in her car but when she sent her friend a text and she didn't respond she got worried so she drove here and saw someone with long hair walk in the dorm and when he didn't come back out she thought it was her friend and thought the worst. I also found out that my girlfriend has seen my texts with someone about a video game and thinks he's a threat to her so she took it upon herself to have her friend check my room and make sure I wasn't with him. So yeah now I'm just confused and I don't know what to do and my girlfriend's mad I couldn't protect her from whoever she sent to my room<br><br><br>TL;DR: a girl i don't know slept in my bed naked and my girlfriend made her check my room to make sure I wasn't with some guy she thinks is a threat to her