Crux execution
Executioner
Maybe she was executed on an alien planet where the magnetic field has an effect on the iron content in her blood that stops it from sinking to the lower part of her corpse.I'm sorry to introduce a note of grim realism, but if Nikita had been dead for three hours, her body would certainly not be that colour.
Maybe there's an electro magnetic effect in the planets atmosphere that stops the cell tissue in her dead body from decomposition causing her dead naked body to never rot and astronauts from earth travel to extract blood from her dead body because it has healing properties causing her corpse to be worshipped for hundreds of thousands of years.