I don't think it's been established that Lilith even exists in this world yet. Dreamgirl is definitely a powerful methusalah (ie. an ancient slumbering vampire) at a minimum. Whether or not she rises to the level of an antedeluvian (ie. a clan founder) or even Lilith herself remains to be seen.
when the arcon's goons came to take then scooby gang, Marcus scared them off hinting at diablerie, probably it's still a crime.
Diablerie is very definitely a crime. Marcus was making a point to the two thugs who thought that because they worked for the local archon they could get away with breaking the law themselves. The laws protected them from him just as much as they protected Sharon from them. So if the laws no longer applied for the evening as they claimed, there was nothing stopping him from draining them dry either.
Marcius is still a fast mofo, and Sharon's powers might not work on him
Agreed. It's unlikely that she has enough *oomph* behind her domination ability to command the archon. She has enough difficulty with strong willed humans. And even if she could pull it off, Marcius would just avoid looking into her eyes until after he had squashed her.
perhaps Sharon was hunting on Malia's turf and got permisssion from Malia's thrall, so she knows the name but not the face to associate it with
I suppose that's possible, if not a particularly appealing resolution to the apparent inconsistency. It still doesn't explain the MC's own apparent surprise however.
Dreamgirl also asked MC if he has what it takes to defeat him, and she certainly wasn't talking about Marcius....
In the material that inspired Rebirth, otherwise bored elder vampires nursed grudges against each other over the centuries, engaging their pawns in battles with the pawns of their opponents. Ultimately the elders themselves were controlled by sleeping methusalahs who manipulated them to oppose the elders doing the will of rival methusalahs in chess like battles, often referred to as the Jyhad, where the elders are the higher ranked pieces and the young vampires are lower ranked pieces.
Dreamgirl is most definitely a slumbering methusalah and probably has an enemy methusaleh she wants to defeat, and to continue using the chess analogy, she may see in the MC a pawn capable of becoming a queen at the right moment. I also wouldn't put it past Dreamgirl to have put the suggestion/impulse/whim in Calisto's head to make a childe, or even several children, and to see which survive to become useful pawns. Calisto may be a top shelf elder, but Dreamgirl is even older and more powerful yet, and Calisto is likely one of Dreamgirl's highest ranked chess pieces.