Can she really sing?

Watching Sopranos Home Movies again. I noticed that when Carm/Edie was singing Karaoke, it seemed that Edie was singing off tone on purpose. I'm I correct and she really can sing and just botched it on purpose or am I reading too much into Carm as I always do. You could tell she seemed like she caught herself and was like oh shit I can't sound too good.