White guardian drank an rpot when I attacked her some hours ago, I ran away because she was too strong for me. Smeyan logged on and went to go kill her and he could not hurt her until he cursed her. She was stunned his entire fight, did not drink an rpot that he could see in chat and only had 1 rpot left on her afterwards, this was because she drank it against me.

it could be that her timer froze(if there is a timer), when I recalled and was not near her for hours.

The rpots should run out for players or NPCs in the same manner as far as I know.

Yes the rpot ages as normal.