I don't see it as being a very long break, really, as there were some recent new songs & PVs in Secret and then a new song and PV for A BEST 2, not that long ago

Not a single, but it's new music

Maybe she's taking some time in between singles to work on new songs and ideas, if she is it might be a good thing. I agree with what asongforXX said, she deserves to take a break from her normal hectic release schedule.