Books are good source of general information but they still leave a lot of things out. They seem to be geared more towards the sideliner rather than the 2-10 hive hobbiest most of us are. This forum goes a long way towards filling in the gaps of information the books leave out.
That said, the queen does take a break, more often than you might realize, but she should still have attendents even then. As long as your queen is laying in the cells of recently hatched brood within a few days of hatching you should be okay this time of year.
A slow down, smaller brood area on each frame, may take place as early as August as the bees start to gear down for wintering.