Labels don't release singles in December very often. Singles released during that period are DOA. January is perfect, November is ok.
I honestly couldn't care less about album sales. I know I sound retarded but unless you are Adele, you aren't really selling albums anymore. Look at Goodbye Lullaby. I just want her to rack up a few big hits so she can stops performing the tired ass Breakaway singles everywhere
Mr.Know It All could be her highest charting single on the overall AI chart and her biggest selling single to date if they wait till January to release What Doesnt Kill You.