No doubt Mei is so good live, that's a good thing even though I always knew it since "Israeli idol" I hope she will qualify, if she won't I really think that Israel will never qualify then (we sent all kind of songs since 2011, from Dana to Moran, from ballads to uptempo to strange song, from completely Hebrew to English-Hebrew songs)!
3 years means nothing. Several countries go years without qualifying, then qualify. Look at countries like Netherlands, Bulgaria & Slovenia.