Hi all, sorry I did not comment on this sooner, I was out of town.
I have one of the rare ¼ scale Queen Maquettes (less than 5 exist) and there is NO WAY that the spikes on her back were connected to the Resin rods that were suspending her in the hive.
They all have a symmetrical shape to them, and near where they connect to her, there is a hlaf disc shaped plate.
The resin rods that held up her body where actually attached to the end of the eggsack that connects to the Queen's body. The top of the eggsack is actually what is holding her up.
That being said, the spikes on the Queens back look like they should be very mobile as where they grow out of her actually is raised out of her back, almost like a movable knuckle under a semi-flexible part of her exoskeleton.
She could have easily held a few eggs back there.
Also, even without the eggsack the Queen DOES have a vagina like orfice. Given her size, she easily could have an emergency egg or even two up there.