Heh. I feel her position is even more precarious. Still think she shouldn't have been brought into the arc. All that's happened is her getting trolled. Her invulnerability is her saving grace for now. But her being in Wano is superfluous to actual events. The porotagonists either ignore her or roll her out of the way, she's not effective in helping the antagonist side at all.
Even the notion that she will betray Kaidou and get an opening on him for the protagonists to finish him off doesn't quite work anymore. The Scabbards can cut him, Zoro has an UBER Special Sword from Oden himself, Luffy got SPECIAL HAKI...No real need for an assit from Big Mom, really.
Have a few thoughts as to her actual role. But all this will probably become clearer once the whole 'Kill Kaidou' plot gets done with.