Orlaith like other housemates is playing the game. She has a perfect right to do so. Dereck the snake plays the "Let's plant poison down for idiots to swallow" game. I think Orlaith is relying on reverse logic from the viewers. Some people like to see housemates suffer. She knows that. So she is appealing to the lets keep her in to suffer brigade to reduce her vote count.
I doubt it will work this time (Did last time against Science. Thank goodness)......I think she will go tonight and leave that mixed up imbecile attention seeker in high heels still in the house along with his frind Mr over flowing with venom (Dereck)...