Well so far the book has mostly been the O5 so she hasn't really had much of a chance to disagree with him on much. As for her leaving as it'll happen someday whether at the end of Bunn's time of writing them or not I could see Magneto be willing to go to some degree or do some act of violence or his plan would mean the deaths of so many that Lorna couldn't agree with it, not that she'd side with his enemy or anything but that she couldn't help him with the plan and if he went ahead with it he'd do it without her and she wasn't going to stick around afterwards at the very least or something of that nature, though I wonder how much of a leeway Lorna as leader will have with Bunn, would he have her fail miserably or because of how he seems to view her and Magneto that he wouldn't allow her to do badly regardless, not saying that she's a bad leader but I don't see Bunn ever having Magneto fail terribly at any mission that he does...
Though I'm also not sure that the upcoming Blue lineup will be around for like 10 issues or anything and is probably only together until the young O5 come back, now that adult Jean and Warren are back and themselves again...though this all still seems like if Magneto owned a company and gave a big powerful job at said company to Lorna, that Magneto being her dad or leading this whole team isn't the reason that she got the lead or that those who she leads join the team...