I need help finding a christmas song

We heard this song for the 1st time 2006 or the year before,on the radio. Have not heard it yet this year. It's A capella. A young woman sings it ( almost like a little girl 11 or 12) and it is unbelieveably beautiful. I cannot remember a single word. It's not a traditional christmas song(in my opinion). My Boss thinks she sounds like Alison Krauss. This is all I have to go on. It is frustrating. Should have paid closer attention when it was playing. Thanks in advance

Maybe something from Charlotte Church's Christmas album? She recorded it in 2000, when she was just 14.