Are you using a temp gun to measure the temperatures? I'd also get an Acurite hygrometer, which is digital and much much more accurate than the dial one you have, for measuring humidity.
If you continue to have problems, switch her to a 15 qt tub setup linked above.
If you don't want to, then I'd cover the other two sides with black paper to improve the sense of security. The reason why glass tanks aren't recommended for BP's, especially young BP's, is that it's not enough security to get them to eat, and more difficult to get humidity and heat to the ideal ranges.