What do i do? Just found out my friends smoking....?

So a few days ago my friend who was thinking about trying to smoke weed told me about my other friend had already done it and i didnt kow about it, and a bunch of us were talking about it , and shes like flipping on me saying WHO TOLD YOU? and shes just trying to make it like its nothing, saying no one ever died from weed and how she doesnt care and stuff. what should i do? i dont want to not be friends with her , but she all mad now about everyone and i know its her life but stilll , its weird. what should i do? let it go ? let her be mad ? try to talk her out of it ? idk