Already said previously, but flawless. She's been fantastic every step of the way.
And about the whole "boo she had a record contract before, she's undeserving" thing, why is that criticism always solely aimed at Dia? Javier was signed to Capitol Records for six years. He also had songs that charted on the Billboard Hot 100, something Meg & Dia never had. I think it's stupid to single her out when a lot of the artists have either been signed to major labels, released many albums, toured extensively, or a combination of the three. The bottom line is that Dia hasn't had that big break yet, and The Voice has nothing stipulating that you can't have been formerly signed by a record label.
I loved this performance, but I'm sad that Xenia went home. She's like a younger Adele, and her voice is only going to get stronger with age. I didn't want either Dia or Xenia to go home. I'd much rather have Beverly, Vicci, Dia, and Xenia as the final 4.
Javier is good and all, but he's already had so many chances.