AITA for leaving state for Christmas despite my roommate begging me to stay after she went to jail?

I (19M) have been living with my roommate, Ashley (18F) for roughly two months. Ashley had taken me in after her breakup, and she could really use the extra help, as the rent was split between them.

For context on this situation, I have ovarian cancer (I'm trans) and I should also mention is that Ashley is a recovering drug addict, and recently relapsed about two or three weeks ago.

Now that you know that, here's whats going on. After my chemo appointment yesterday morning, I came home and went to sleep. Its extremely tiring having to do treatment twice a week, so I was exhausted. I went to sleep at around 1:30 and woke up sometime around 9. Ashley would usually be home by then, but she wasn't. I thought that maybe she had a late shift at work, so I let it be and decided to wait for her to come home.

Fast forward to 6am and I have called her several times, left voicemails, and texted her over 15 times and haven't heard anything. As anybody would, I started to worry, but I know that she sometimes stays with her mom, and thought that maybe she forgot to tell me, so I went to sleep.

I woke up at 2:30 this afternoon to find that she still hadn't come home. Panic set in, and I went to the police to see if she had been in some sort of accident and was admitted to any local hospitals. After two hours, a missing persons report, and an interview with a detective, I found out that she had been arrested for possession of a controlled substance. I was livid to say the least.

A few hours later, I got a call asking me to go and get her, as she had left her wallet at the house and she needed money to bail her out. Please note, this is money I gave her for rent this month. I agreed because I don't want her to stay in jail. After I picked her up AND got her car from impound with the rest of the money, we came home. I thought that I would get an apology for not being informed or something, but instead, she asked me for MORE money.

When I asked her what for, she said that she needed the rent money back, and she couldn't pay my part with her salary. When I refused, she told me to cancel my trip home and use the refund to pay my rent.

Extra context: this trip was paid for by my parents for me to come home for the holiday, as my grandmother is sick and this will most likely be our last Christmas with her around. The trip costed them around $500, which is my share of the rent, and the refund money would come to me, per my parents request.

I refused and was dumbfounded by her even suggesting I cancel on my folks, for obvious reasons. She called me an asshole and told me that I was a bad friend for not giving her the money. She then offered to make me pay just her car payment instead of my rent share again, as that's what is holding her from paying the whole rent. I also refused to do that. She stormed off in a rage and now I feel like I'm in the wrong. So I gotta ask, am I the asshole?

Update: I just got off the phone with one of my close friends and he has decided that I can move my stuff into his place before I leave for my trip, and will also try to find another place for me to stay when I get back so I can get out of this situation.

Edit: I see some people thinking that this is my first time being around an addict, but unfortunately its not. I am also a recovering addict as well and I have been sober for going on 4 months now. The last time I used was after I found out about my diagnosis and I broke my 2 year sobriety streak. Also, some people are disregarding the fact that I mentioned at the beginning that I am a transgender male and using she/her pronouns, so I ask that you respect my pronouns please.