This tank is a lot better!
Covering three sides of your current tank with black paper is also worth a try (if you don't want to switch to a 6qt tub) so she feels more "covered" and secure. This 5 gallon tank would actually be most suitable for her for the next few months. The 40 gallon tank can wait until she is almost completely full-grown.
As mentioned, avoid handling at all until she takes at least one meal for you... better two meals...
It's much easier to get them started on live hoppers, especially at this point if she is only a month old and may never even had a meal/had only one meal.
You will need a thermostat for the under-tank heater to regulate the temperature. It's a very required piece of equipment. If you don't want to spent big bucks, there is a good $30 one on amazon: http://www.amazon.com/Hydrofarm-MTPR...mostat+reptile
A digital hygrometer to measure humidity is the most accurate. You can find an Acurite hygrometer on amazon or walmart for under $10.