The temps seem about spot on, don't let the hotspot get too much warmer though. Newspaper works great as a substrate if your not going for looks. However you did mention that you adopted a baby BP, and a 40 gallon tank is going to be 'way' to big. Generally you can keep babies comfortable in a 6 qt plastic tub, might want to step it up to a 16qt or so depeding on her size. Adult males can be kept in a 32qt comfortably for pretty much their entire life, while females can usually fit in a 41qt. Also be sure that you have tight fitting hides for her too, the more snug she'll be in them the better. Also do you have a way to measure the humidity in the tank/tub you'll be keeping her in?
Anyway hope this helps alittle, and good luck looking after the new BP! Hope she'll start eating once she feels more secure.