Imo, let her apply to a top guild. Let her realize how much she has to go. To quote a movie, "the only way to get better at chess is to play someone better than you." She may feel like she's a top raider right now b/c she's one of the better players in a mediocre team, but as I learned, and I'm sure you've learned, just because you're "top heals" or "top dps" in one guild doesn't mean that you're even gonna be top 3 in a different guild.
"If the world is something you accept rather than interpret, then you're susceptible to the influence of charismatic idiots." -Neil deGrasee Tyson
Twitter @Aggathon || @Tankspot || Twitch.Tv/Aggathon