They could just select another young person to take Odona's place since she took Kirk's and then the plan is back on track.
Please explain. The plan is already back on track by virtue of Odona carrying the disease that will help slaughter the populance. But since Odona won't die, the part where she sets an example doesn't work any more. A random youngster dying for the cause would not have the political impact of the Head Honcho's daughter volunteering...
Timo Saloniemi