Welcome at this time of year your hive should be brimming with bees it gets harder to find the queen the larger the hive gets but if there are young larva and eggs in the hive the queen is in there. If the queen has used up all her space to lay in give her more room. Anticipate the needs of the hive, every caped frame of brood that hatches out will require 2 frames to hang out on. Renovate the hive and add the addition before the kids arrive. Some times you got to remove some clutter from the kitchen to give momma some more room (remove honey from the brood chamber and insert frames for the queen to lay in). Busy bees are happy bees. Board bees become restless and swarm.