You did nothing wrong. saying good morning is not going to set her back in her language efforts. I can see the frustration with that if you ONLY talk to her in her original language when she’s trying to learn…but you said two words. She was probably just having a bad day or feeling particularly sensitive about her language skills today, but that doesn’t justify her blowing up on you like that. It’s pretty ridiculous to be so offended of someone saying two words in their language.

Don’t beat yourself up about it, and please continue going out of your way to connect with people, as it’s very nice what you’re doing. Although I would not speak to her in that language again since she requested it…even though she did it very rudely.