It‘s unlikely Polar targeted her though. He‘d have 3 stacks.
Let's think this through
2 stacks for targeting her
She can give 1 out per night (with her track)
or use a track without giving out rot
And Melkor gives out 1 rot each night.
Do we have Melkor's targets claimed?
Unless Melkor claimed to have targeted Polar, he should never be on 2 rot night 2.
So he must have shot her. That part should be correct.