What key is Kelly Clarkson's version of "Grown up Christmas List" written in?

I know Amy Grant's original version is in B flat, but that's way too low for me to sing haha. I'm not very good at deciphering key signatures, so can someone please figure it out for me? I swear I will try my best to make Kelly proud at my school choir concert!! Thanks =)

I really don't know .

C ... !