Even when Magneto refused to join their cause, Havok launched another new kind of Sentinel, this one focused on distributing Mothervine, even though the previous experiments had netted horrible aftereffects. Frost became even more concerned with Havok's state when Miss Sinister let slip that they would be able to control the new mutants created by the process. Eventually, she flipped, freed the X-Men and even helped bring Havok's natural personality back to the surface.
Knowing that Magneto planned to get revenge, Frost ran to Paris where the time-traveling, young X-Men caught up to her and told her they would stop Erik from getting her. Magneto used Mutant Growth Hormone to up his powers in his attempt to kill Emma, but in X-MEN: BLUE #31-32, Jean Grey called for Pickles, a teleporting demon, to Bamf! in and take Frost away to hide out in the young X-team's cabin.
Not one to rough it for long, Emma Frost turned to Bobby Drake for help, telling him that she suspected her father, Winston, had been using his newly revealed mind powers on her brother Christian. When they realized that Christian had actually developed the powers, killed Winston and manifested an even more cruel version of him, Bobby allowed Emma to bring Christian into Drake's mind. After fixing things there, Emma moved on in ICEMAN #1-2 to dedicate herself to training her brother in the ways of his powers and taking control of Frost Technologies.
After getting mixed up in Gamora's reality-warping antics in INFINITY WARS, Frost decided to refocus her efforts on destroying the Hellfire Club. To get this done, she appealed to Rogue and the X-Men for help, which the team gave, but only if Emma told them absolutely everything about her plan up front. In X-MEN: BLACK - EMMA FROST #1, Frost pulled a fast one on them, though, when she took Sebastian Shaw out and then claimed his title as the Black King in hopes of turning it around.