She does have a lovely personality, and she's someone I'd like to be around.
But sometimes I suspect her non-confrontational sunny disposition hides ulterior motives.
For instance, she coldly threw Marc under the bus in countless friendly chats, when he was in the secret room, so as to win new friends. Then, as soon as he came back in, furious with her, she won him right back into her camp with some immensely exaggerated fawning.
With regards to pressing the button, if you look past her silky smooth sweet words about caring for Jack, but needing to protect the pot, isn't it more likely that she simply realised her own chances of survival were higher if Jack was nominated than if Chloe was nominated lol?
What I am saying is that she may come across all friendly poodle, but she's got a hidden bite.