So turns out Hale herself is under union and receives set wages. It's not that. That really just leaves two scenarios (both of which point towards Platinum wanting to replace her as voice actress themselves). Either they truly just didn't like he work as the character and wanted to go for a different delivery or she's difficult to work with. Nothing else really makes sense now.
I can't pretend to know how these things work, but like, Hale was not credited for Samus' grunts and often these people go uncredited or they change their names to get around Unions for projects. Laura Bailey is a big name now, but Funimation still somehow got her back to reprise some role she played in the Fruit Baskets anime. I doubt Funimation opened up the wallet big for that. I imagine it was a combination of the role being something Laura was passionate and nostalgic about, and working out a deal with Funimation that was acceptable to both parties. Troy Baker, also now a big name but used to be a prolific game/anime VO, implied that he was willing to be flexible to reprise his role as Yuri for the Tales of Vesperia remaster, but Bandai Namco simply didn't ask him (likely assumed he would cost too much).
Add to that, Jenna Cox, who's basically Britain's Hollywood star, who played Melia in the Wii version of Xenoblade Chronicles, looking for any small job she can, before she hit the jack pot with Doctor Who. Nintendo still got her back for the Switch games. How? I dunno what deal they got behind the scenes, but I imagine it was something they worked out for both parties and she was willing to take something small for the fans she appeased several years ago. I doubt Nintendo payed big for the smaller than Bayonetta role to be reprised, even if Xenoblade is the bigger, more popular game. With Hellena, the two parties couldn't find an agreeable deal, and I can't say I know what that deal really comprised of. I mean, an on-going theory with Bayonetta 3 is that the Bayo we play as is the grown up version of the little girl from the first game, and this title will deal with crazy multiverse crap that's infested pop culture these days, so maybe Hellena's lines were going to be limited for that reason. I don't know.
Rejection is a BIG part of the VO world, and I imagine having your sole defining role looked at as low value (hence low compensation) and taken from you (recasted) would be a pretty big blow to the feels. But you can't settle your life on one role in this business, much less one with such a limited appeal to internet savvies. Bayonetta ain't Batman or Joker, or even Solid Snake. Bayonetta's sales are closer aligned to the Atelier series (okay, maybe a bit better than that WW). Astral Chain, Platinum's other Nintendo game, has been far more succesful than Bayonetta. The lady needs to pull up her boot straps and find new roles and flex her talents. She's now shot her Bayonetta chances on the foot. That role's gone now. I do wish her luck for her future, something she should think more about now, and less about her Bayo gripes.