She creates stinging insects that inject everything she's invented to fight this disease - one of the longer-acting ones that often slips under her notice - alongside healing serums. She accelerates her experimental fields dramatically, testing millions of potential cures, sifting for the most effective.
It's hard, though, to work quickly enough Best Singer won't die of thirst - she's been focusing on keeping disease down on a population level, mostly - it's already done tremendous damage.
Her puppet curls around Best Singer, ignoring the swarms of shimmering insects trying to deliver cures and then trying to manage the side effects of the cures.
She's certain it'll work - Best Singer starts to recover noticeably, her scales regaining the appropriate shine, her breath becoming less labored. She erases every single microbe in Best Singer's body - she understands the beneficial ones well enough to replace them by now - healing already done damage is possible with magic she's already developed -
And then Best Singer's heart skips a beat.
Her brain activity ceases.
She promptly tries to put Best Singer back -
What has been destroyed is gone forever.
The Sky-Scaled One begins to keen, the sound echoing in every corner of her creations.