Just thinking out loud.
Adrienne could have made it home and talked with her roommate. She packed her bag and was set out to leave. For whatever reason, someone could have suggested to go with her to her Bfs, drive her if she was too drunk, or forced their way to go.
We do not know WHY she was going to bfs.. was it to get some of her stuff? Resolve the fight earlier? Egg his house? Who knows. But now lets say we have someone in the car driving with her. Said person may have tried to steal the car with Adrienne in it or said they would drive. Driving erratically and speeding per 911 call.. Something happens causing them to crash. (ie turn of wheel due to fight, speeding, or purposely done) Car is unable to drive and person tries to speed off and hide somewhere. This could angry anyone (with a plan in their mind) because things did not go there way. Or person could be comforting Adrienne, "Its gonna be okay, lets try to get closest to apartment as possible"
Somethings goes bad after crash.. or up until cab. In which she was told to call the Bf has if you were going there. They know his phone is off after the first couple calls and if he answered she could have been threaten to stay cool. Call a cab to make it look like you left.. Keep calling until you get one. Text bf your coming over, because that's where she intended to go.
Person has someone else pick them up somewhere.. Waits for call from cab, tells her to say you'll be just a minute or i'll kill you. Person could have returned belongings and clothing to her room unnoticed or unusual because they are hosting a party with many people.
Question: When did anyone noticed, the exact time as close as possible, that her clothing were in her room? After she left the second time? The following morning?
Also, how can they determine any other clothing was missing and/or if she in fact changed? Was just her shirt and bottoms there? (sorry if wanting too much info) Was her underwear there or not? If not, could be it contained dna evidence perhaps of someone else. I don't know, maybe I'm thinking too much there. Or she simply kept the same undergarments on if she in fact did change.
Her pink charger is missing she may have had it in her bag she packed. Probably those ones from walgreens, all colors, I have like 4 laying around maybe two that work (One kept in my room, other kept in car to use at work/bf house/car/elsewhere) They're cheap so they break easily.
just my thoughts.