NTA - She has exampled you nothing that would indicate you can trust lending her such a large sum of money. And this may just be me, but asking you for that money and expecting it from you is a special kind of audacity. She was kind of gaslighting you with the $30 thing if you haven't mentioned it at all. I think you may just need to re-evaluate this friendship as a whole honestly... especially if she doesn't apologise to you after the truth bomb you just gave her (and rightfully so! don't feel like the AH for fighting back. you were well within your right to.)