I don’t think people give Gwynevere enough credit. I keep seeing her written like she’s this airheaded bimbo and personally I think that’s a boring and disrespectful reading of the character. This lady marries a king (probably marries multiple kings (and queens I’m sure)) because she, just like her dear little sister Gwyndolin, loves being in charge, she just prefers to steer from the backseat. She’s just as clever and conniving and knows exactly what she’s doing and she has no problem toying with and using people to get the Flame linked and keep herself in power. She may have had a hand in the linking becoming as politicized as it is by DS3 and thus wresting some control of it from Gwyndolin, who had facilitated it in the past, their sibling rivalry continuing even long after she left their home.