Could you go to Nao's twitter account and wish her a happy birthday? I think 誕生日おめでとう will do; but you may use お誕生日おめでとうございます if you want to be formal. I want to cheer her up the only way I can. I already left my birthday wishes on her account; both in English and Japanese.
@Hackers @Girl Group @J-Rock
@Hackers @Girl Group @J-Rock