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I was under the impression that Sheryl had been planning to sacrifice herself for the sake of Frontier for a while, based on her conversation with Luca and Leon in episode 23. I don't think that "giving up" was ever really an issue, because as far as anyone knew, Sheryl's impending death was set in stone. She realized that if she didn't have a chance of surviving, herself, then she might as well sacrifice herself to give hope to the people around her. If she, Alto, or Klan believed that there was a possibility of her cure, I would expect that the decisions that Sheryl made would have been different.
When and how Ranka found out there was ever a possibility to the contrary was never revealed in the story, to the best of my knowledge, and her method of communicating her wonderful discovery strikes me as odd, to say the least. Not that we ever really get much explanation for the decisions that she makes, post-episode 21.
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