i think she is talking to eris at the intro, she calls her "mysterious friend" and she mentions "ever since u escaped that pit".

wether shes of the darkness or not that doesnt change the fact that shes a hot chick

Those bolts are Harbingers, her personal weapon. They're like the Reef's nukes.

Grimoire card: The Aftermath "Do not fear, brother. This was the only choice I had.” The sound of her voice ripped him from sleep. He jumped up; his ship was still contained in its protective sphere. He tried to retract the shield, but it was locked to its initiation time. He couldn’t remember activating it. Then he remembered the battle. That blast. What that ship fired was ancient, not bound to anything the Origin Libraries even sought to describe. He tried to calm down. He thought of her, searching for her pull. He couldn’t find it, but he was not calm. She always told him she would always be there behind the calm. All he could hear were echoes of that sound. It began as soon as they hit the ring plane, ringing in the old glimmer of his long-buried self. Before she showed him who he was—in the before and the after. The Techeuns should’ve known what the Dreadnaught could do. Must’ve known. Did they not feel what he felt? Hear what he heard? And that damn Ketch, it wasn’t protected. They had to know that. All to deploy the Harbingers. They barely got a foothold before the weapon was fired. He thought of Petra and how overwhelmed she must be, forced to hold her post, and watch her people perish. He tried to calm himself again, forcing long breaths. He realized where he was: Mars. Athabasca. The Candor Isles. He hadn’t been here in so long, not since he found the Black Garden. The countdown to the shield’s deactivation pulsed. He tried again, to home in on her, to find if she truly gave herself for this battle. He felt close to something, a hum of starlight, then shield deactivation broke his focus. He climbed out and saw the damage to his ship, and the truths of the armada's devastation sunk in. He turned in despair to find hundreds of his Crow drones, deployed on Mars long ago, circling his ship, waiting. “Welcome back, Master.” The one closest to him spoke first, and the others followed, a wave of salutations echoed throughout the dry sea. And with that hope returned. “Begin repairs on the ship immediately. Something has gone missing and you will help me find it.”

I speculate her being an antagonist in the sequel. Nobody with that much ancient power lore wise ever ends up being the protagonist.

She's in my vault surviving on tiny boxes of raisins.

Cool

They weren't guards, they were the techeuns (awoken priests who are given powers through implants), and the things they summoned were harbingers (we're not entirely sure what exactly they are, but they can have children and are currently doing so within the dreadnought). As for Mara and Eris, they're friends but not blood relatives. There is a lot of evidence however that link the Hive and awoken together. Mara could possibly be Savathûn or Taox, though that's higly speculative.

Read the grimoire card: The Coven. Talks about the preps for the dreadnaught attacks with the Harbingers and the Techeuns. Good info

The three that surrounded her are the Techeuns (they're like Awoken sorcerers). In the grimoire, they summoned all of the Harbingers except the oldest one.

The 3 awoken surrounding here were the Techuns, kinda like wizards, but awoken. There's actually a whole council of them. Then what she summoned were the Harbringers. Here eyes also didn't become Taken, they were a brighter blue that almost matched the color of her irises. I doubt that the queen and Eris are related, at least in that way of a family relationship.