AIO my gf made a joke about my dead mom so I left her in the street

I honestly feel like she deserved it. We’ve been dating for a few months me (23M), her (21f) and just recently started getting into deeper conversations about each other.

Anyway, a few nights ago, we were on a drive back from one of said dates and I brought up how my mom died in a fire a few years ago. Her response was that she went out in a blaze of glory and she laughed. I was completely caught off guard. She’s a nice girl and hasn’t made dark jokes before. So idk? Is this a red flag? We got into a little argument because I called her a bitch and she went on to say it was just a joke and that I didn’t need to call her out of her name. We argued for a bit until she finally apologized but it didn’t feel genuine so I told her to leave my car.

She’s been really cool otherwise, I genuinely thought this girl could be the one before this. She’s beautiful, kind, we share an active lifestyle, goals, she’s independent, etc. Now I’m questioning it. Should I look past it? She’s says she wants to continue dating and that it won’t happen again.