A) That's not a question
But I assume you're wondering if she is drinking. I've only caught one corn drinking before in all the years I've owned snakes but never lost one to dehydration. I don't know how to explain it except maybe they don't drink often or tend to drink when we're not watching. Personally, I thaw my rodents in water and feed them while they're still wet. The water is warm like a rodent would normally be, but I assume it also helps to keep my snakes hydrated. This could be why mine don't drink as much.
B) My "true rats" (bairds, black) aren't adults yet but the corns that I've raised to adulthood all poop less now. Any young snake will have a faster metabolism and probably go more (assuming it's fed enough).
C) Depends on the individual. One of my bairds is always buried under aspen, the other is almost always in plain sight. My black rat likes to hide in his plant. Giving it a variety of cage furniture may help, but it may just be shy. It should only get bolder as it gets older and grows accustomed to you watching it though.
I hope that helped-just my experience.