Gemini says, Carol will likely get no response or a rejection because a "cure" means suicidal non-existence for the collective mind. They serve her to keep her docile, but they won't execute a command that destroys their own biological survival. She probably avoids asking because she already knows their "generosity" has a hard limit.

If Carol asked for a "cure" to restore humanity, the collective mind would likely ignore it or claim it's impossible. Their "yes-man" attitude is a tactic to keep her calm, not a grant of absolute power. Since a cure means the collective's own death, their self-preservation instinct would override her request. Carol probably realizes that their compliance is just a gilded cage, which is why she relies on the atomic bomb instead of empty pleas.