>>30976177>Vanity and JealousyWere you paying any attention to her character at all? Her husband got sucked into an Ultra wormhole and disappeared because of his research into the Ultra Beasts, and Lusamine desperately continued on that research in an effort to find him. She found Nihilego, who injected her with its toxins, and amped up her already existing obsession with learning about the Ultra Beasts to what she's like during the plot, without caring about anything else.
If anything, her plot line is a lot more like Jenna Angel's.