Or you can say "教えていただきありがとうございます(Oshiete itadaki arigatou gozaimasu)" (= Thank you for telling me.) Maybe I guess she guessed you are good at Japanese because of your profile. According to it, you are able to speak C2 level Japanese. That's why she didn't add romaji, I think.

I think, "情報をいただきありがとうございます。"