Ok, here's what I'm confused about with Alien 3 (TR and AC)...So, the Queen layed one last egg on the Sulaco, but somehow a normal facehugger was able to plant two embryos:
1. First embryo was planted in Newt and the Queen chestburster crawled out of Newt's cryo-tube, after the crash, and slipped into Ripley's mouth (as mentioned in the Alien 3 comics)
or the first embryo was planted in Ripley, originally.
2. The second embryo is planted in the dog, even though it is known that facehuggers (USUALLY) die, after planting ONE embryo in a host.
Also, the Super-facehugger in the Alien 3 AC was just for the ox right, and wasn't the carrier of the Queen embryo for Ripley? It would've been way too big to fit on a human face.
Where was the Super-facehugger egg?
And yes, that would mean the Queen doesn't need a egg sac to lay eggs. Once it's mature, I guess it can lay eggs with/without an egg sac present.
As for the origin of the Queen in ALIENS...it's up in the air. Cameron left that info out for us to speculate/theorize, I guess.
Russ Jordan carried the Queen embryo, or when other colonists brought back other facehuggers (attached to faces or not), the Queen emerged out of one of them, along with some Alien drones.
If we use this regurgitation method, it could be that the Queen might have bursted from Russ Jordan and as it grew, went around and used this regurgitation on the other colonists. The Queen could certainly hide very well.