If you are seeing worker brood, they are also probably trying to supercede her. Find out for sure if what you saw was a queen cell, and if so then your best bet is to leave them be.
If you are not sure, and don't think that was a queen cell, then you can just re-queen the hive (I make it sound so simple...
Sure, there will be too many drones for a while, but they can adapt to that. I had too many drones in one hive and ended up shaking most of them out and puting a queen excluder on the bottom and then eventually had to get all the drones packed on the bottom board out. Not worth it if you can avoid it.