18 Parents Kicked Me Out Of The House, Off The Phone Plan, And Are Demanding The Car Back

Location: Wyoming I'm an 18yo college student. During my winter break, my mom made a deeply hurtful and personal facebook post on Facebook about me and my trans identity. I commented on it, defending myself, and drove to my boyfriends house while screaming crying because I was scared what would happen if she came down to my room after seeing it. At around midnight my mom texted me that I was no longer allowed in the house, not even to collect my belongings. I immediately went back to the house with my boyfriend (she was at work) to throw all of my belongings into my car. I had to leave for a study abroad trip 2 days after and wasn't packed. The next day I was removed from the phone plan completely. My sister (14) messaged me asking what had happened and I explained it to her. My mom used an app to view her texts, screenshot it, sent it to me through Instagram (I had her blocked everywhere else), and said there would be "consequences" if I "went after her kids." It's about two weeks later and I got a text from my step-dad saying that my mom is demanding the car back if I can't "find a middle ground" with her. I said that I will only have an in-person group meeting to speak with her and kindly asked that he help me arrange one. He declined.

My questions: 1: MOST IMPORTANT: What would happen if my mom took legal action against me after not returning the car? At this moment, my step-dad said that if I'm not returning the car I have to tell him by tomorrow morning. To me, this means they will take legal action and I worry cops are gonna show up and take me to jail or something. I need this car and I pay for the gas to use it. I did not buy it and I don't pay the insurance. Please explain to me what the worst case scenario is so that I can make the right decision. I really do not want to unblock her. She is extremely verbally abusive.

2: What can my mom do if I stay in contact with my siblings? My grandparents believe she will take legal action against me and because I am 18 I will get in big trouble being in contact with a minor without parental consent.

3: I was informed that I could take legal action against my mom because of being kicked out of the house without 30 days notice. Is this true and what does that entail? I don't necessarily want to do this but I would really like to know my options.

I am currently waiting for an email back so that I can book an appointment with an attorney. Since my step-dad said I have tomorrow morning to answer, any help regarding that is greatly appreciated, since I definitely can't get professional help by then.