AITA for strongly encouraging a drunk friend not to drive?

**TL/DR: Drunk friend said she’d drive. I strongly encouraged her not to. She was offended.**

I got an evening full of drunken texts from a very close friend visiting the country where she’s from. They were pretty fun. Then at 4:30am comes this:

**Her**: "*My friend is driving me to my car.*"
Me: "*What will you do when you get there???*"
**Her**: "*Drive home.*"

I immediately call, but she doesn’t pick up. I send a text imploring her to call her family to come pick her up, to get a hotel, or sleep in her car…. anything but drive.

Eventually she calls. She tells me with slightly-slurred words that she’s fine to drive, she’s done it many times, it’s the culture of the country (which actually has fairly strict drunk-driving laws), and that anyway, she had a bit of food. I don’t change my opinion.

**Her**: "*I’m okay to drive; I’m not going to get into an accident*."
Me: "*Everyone says that. No one heads out planning to get into an accident. You. Are. Impaired.*"

She says that my worry was cute at first, but now she’s getting offended. She’s a responsible driver, she says with drunken indignation.

She’s highly educated, so I reason to her that neither the bit of food nor the local culture impacts the physiological need for time…. time for the liver to do its job of removing the alcohol from her blood, and until it does, she’s impaired.

I can tell that she wants me to say "*Well, be careful*", but I don’t back down from my stance that it’s just not worth risking her life, or heaven forbid others’. I say that she’s an adult and will make whatever decision she makes, but if she does this I will be deeply disappointed and lose respect.

I hear silence punctuated with the start of tears. Then I hear her heels striding strongly. Then "*Goodbye*".

Now I’m just sad. Perhaps I’ve lost a friend. Was I wrong to stand firm in my opinion on this?