Did none of them think to remove Caitlin's necklace just long enough for Killer Frost to heal her - or, at least, stabilize her - and then PUT IT BACK ON? Do I have to think of everything? AM I WORKING ALONE HERE, PEOPLE??
(Besides, I thought that it was the bracelets that kept KF in check, and that the necklace was just a solar-powered recharger.)