When it comes to her initially taking the drug, I think that she did realise that her situation was hopeless, and that regardless of what she does, she'll likely end up dead. At the same time, she did remember the lab rat that wound up an infant rather than dead, and Shinichi whose death couldn't be confirmed, but whose children clothes mysteriously disappeared. I could imagine that she - perhaps only subconsciously - decided that her best chance of surviving is taking the drug.
We don't really know what about the drug and its development Haibara hasn't told Conan, but there are certainly things she's been keeping secret. For all we know Haibara was actually aware that the drug would turn her into child, and is only pretending she took it to commit suicide, so as not to reveal that she knows more about the drug than she's letting on.
I can understand that people look at Haibara's emotional situation, and in the real world would make a lot of sense. Emotions control a big chunk of most people's lives, even if they've been through far less than Haibara has. At the same time, those sorts of themes are not typically addressed in this series.
Raspbryl wrote:Reading too much into things is quite literally in my job description - I would not be a responsible adult if I was lax on the details. My team depends on that - I cant let them down.
What job would that be?