Gf and I have differences about how she should use her inheritance

Long story short, my gf (23) inherited a large sum of money after her dad passed away and has the idea of buying a new car after selling her current one and also saving up a little.

She doesn’t plan to use her inheritance on the new car, just her salary w monthly payments . Still, I know the confidence to plan this on the first place comes from the inheritance.

We haven’t fought about it, but I layed out all the logical reasons why a new car is not financially sound desicion. Also , I’ve told her she’s really young, has a nice job and and inheritance that put her in a REALLY privileged position where even she can do certain things, she is the first and foremost responsible for protecting her net worth for the long run , because she’ll live at least 70 o 80 years more where she’ll need the money.

I’m not her husband , I don’t really have sayings on how she should spend her money. Should I just let got this completely and not say a word n about it anymore ?

UPDATE : I do think I should mention I already introduced her to the investment fund where I also have my money invested. I arranged this since she didn’t have any previous experience with finances and thought she should talk with experts about what to do with the money . This went as one would expect and now has a large % of the inheritance invested in good old safe investments for the most part .

Update 2 : to the ones that gave me their opinions based on how to better address this in the future, if the opportunity arises , thank you ! I’ll keep those advices close to heart. To the ones that said I’m a monster trying to control the woman and take her money for myself: it’s alright, many of the things said here reflect much more about you, than me! But hey this is the internet you are free to paint whatever picture you like