If you go up to Petra Venj in the reef and turn in a bounty or really anything, just across her, she'll say "I'm sorry, I couldn't do anything to help her". Now it doesn't necessarily refer to the queen, but it is a possibility
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Actually in one of the first taken king missions (wolves of mars?) petra is so broken up over the death of her queen that she doesnt come on the comms till the middle of the mission
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