I adore the idea of Queen Mothers due to the simple fact they put a great dash of eldritch abomination into creatures that already exemplify a mix of fiendish biomechanical, all consuming, eldritch abominations.
While I do think the trait of controlling every single alien in the galaxy ever is too much, I do love how it has telepathic abilities that allows her to play mind games with people. An alien that has the ability to probe your mind, induce nightmares, and being hyperintelligent to the point that maybe these xenos are beyond simple animalistic thought, if maybe or maybe not surpasses human thought. Who knows? Death is always a certainty when one tries to understand it as past media shows. Its another wrench in the cogs to keep us guessing, another unknown that leads to more questions. Its just that alien and beyond us, as the alien should be.
Hell, I would add further traits like the Markers in Dead Space. Say like if she was captured and contained in Weyland facility, she is just more living proof to how you simply cannot contain or control the xenos. Have her able send out multiple telepathic signals to its assault its enemies as it begins her escape plan. Those alive and afflicted with weaker wills begin to experience hallucinations and contract dementia, sending the living into a paranoid state causing homicidal and suicidal actions. See the people around her tear themselves apart, opening new opportunities to orchestrate escape and expansion for her and the hive.
In one way, I know some might think its too much already, having more castes when the basic is already terrifying as it is, but I also see it as another reason why these things will always keep us guessing in terror, as you never know what will spring forth from its incredibly violent and ever changing dark nature.