Both those reasons are why I thought it was stupid of June to just let her die. They could have all kept a close eye on Eleanor until the plan finished. As apt as Eleanor was to spill the beans, she was just one variable, one who could be controlled if they put in the effort. Her death could have created other variables, like Lawrence backing out of the plan or June being sent to another house immediately, which June couldn’t control. Just stupid.
While Eleanor obviously couldn’t be taken to a hospital, I thought they could have possibly forced an emetic down her to get her to vomit up whatever drugs were still in her stomach, which could maybe have been enough to save her. (And where the hell did she get enough pills to OD on???)