"Ultimately, the terms presented were not aligned with my values or a level of mutual respect in the relationship,”

This specifically means she (Rhona) declined their offer because she felt the terms were disrespectful. They obviously told her to take it or leave it, and she left it. Had she accepted the terms, she'd still be with the group. In other words, they didn't kick her out, like Ellis said, she could have still been with the group if she so chose.

Maybe the offer was so low that she had no choice but to walk away. But she should honest and clear on that instead of saying on one hand she was shocked about no longer being in the group but then on the other hand saying the terms they offered were unacceptable. She's contradicting herself. Her vocals are not on the recordings of any of their hits, she doesn't have much negotiation power in my opinion.