Hey, piano player here! She actually plays a B diminished triad at the end there, diminished being the most unhappy triad that you can play in a major (happy) scale without changing the pitch of some note. Pianos are never drawn correctly...
So, she's the kind of player who shouldn't enter competitions or anything of that sort. She needs to play in happy events, parties, bars, and such, where people are supposed to be having fun and she can contribute to it.