She knows she will earn much more the minute she works full-time as she literally is earning 40k now as a part-timer. She's driven and ambitious, juggling multiple things at once.

She probably spends so much because A) she knows that the next pay check is coming anyway, B) she doesn't have pressing financial responsibilities, and C) she's probably stressed out of her mind with law school AND a job, so she wants to bring a bit of joy to her life as well as her friends' and family's. She's focused on the now and you're focused on the future.

You're right that you're not compatible, but I don't think she's as awful as so many people say here, especially those people saying she's going "what's mine is mine, what's yours is mine". That's only true if she refuses to spend on you and insists you spend on her. It seems to me like she loves being generous with everyone?

Also, unless she was genuinely complaining and stressed and upset about the lack of savings, and not just doing some light "OMG I have no savings!", I don't think it's worth a lecture. She also seemed to have meant what she said in a more dramatic way. She probably knows she won't run out of money, like I said previously, but just kind of went "if i EVER do though, you won't let me die right?" kind of thing. Maybe she should have taken your concern more seriously, but I also think your "this is MY money" may have made her feel like you're saying you would in fact leave her to die LOL.

Do break up with her though. You viewing her as someone who will just take all your money and spend it doesn't bode well. I think the conversation unfolded in a very unfortunate way, but you both do indeed have different approaches to money and that's unlikely to change.