I installed a package of bees on May 5, 2019 (now one month later). The bees were installed into two deep hive bodies that were fully waxed out and mostly still full of honey (we lost our last colony in mid January after a wild spell of weather). Brood comb looked good and ready for laying. The queen looked healthy at the time of the install. 5 days later we entered the hive to make sure she had come out of the queen cage. She had. The hive entrance was pretty active for several weeks but has died down quite a bit of recent. My wife and I opened the hive today to inspect and the bee population inside looks VERY low compared to our experiences in years past. I am no expert but it he population inside looked like a 1/4 of what I would have guessed it to be. I didn't see any real evidence of brood in the upper deep hive body (I have 2- deep bodies one on top of the other) Also worth mentioning I had a top feeder on with about 3 gallons of spring mix sugar water. Didn't look like they had drank much more than a gallon. In years past the new bees went thru this much faster.
Questions is: What's the most likely issue? The queen isn't laying and has died? Solutions? Its June 6, 2019. Is it possible to re- queen? Not sure how late in the season you can get queens. Thank you!