she might still need improvement; however, like in a interview recently, the interviewer also agreed that she has a lot of talent because she does write her own songs. and the songs coming from G.E.M is directly how G.E.M is and feels.
You can tell it was a good performance by how many first tier singer's heads were rocking with the music at 5:20 and also the loud applause at the end was well deserved.