If you didn't see my post about this a few months ago, here it is.
What happened after that incident is that the day after, mom said she had to go to New York because my stepdad needs surgery up there, so basically nothing happened, because i had to stay with my little brother for a month and take him to school, but mom and stepdad came back on the 15th, and they said nothing about the booster until a few days ago, after the news started pushing this Omicron or whatever bullshit variant this is. Right now, I'm not in a position to where i can do what i did and literally refuse to take the booster, because she wants to be in the doctor's office with me as they inject me, and I'm really fucking worried that I'm gonna get heart problems. i had to get vaxxed back in February, but now, I'm just really fucking worried. I'm gonna document things for the next two weeks and keep y'all posted, and hopefully nothing happens.
As a matter of biology once you're over the age of 13-14, if you don't want to get in the car there's not going to be much your mom is going to be able to do to get you in that car. Even if she literally knocked you out she's probably going to lack the strength to drag your unconscious body to the car and get it in the door. And if your step-dad is recovering from surgery he's not going to be in any state to kick your ass.
Just don't do anything stupid that would give her cause to call the cops, because they absolutely will take her side.