If she's having nice, complete, whole sheds...you are probably just fine. If her sheds are incomplete, in "pieces" or otherwise difficult, then you need to either raise the humidity, or give her a "humid hide" where she can go when she needs it.
It is harder to raise the humidity in a tank with a screen top... The water vapor just goes out the top. Tupperware/Rubbermaid with proper ventilation is easy. The water bowl itself usually keeps it humid enough. A humid hide can be a small plastic container with moist paper towels and a hole big enough for the snake to crawl into, but not through the top. I will sometimes just set an upside down container over a plastic dish and leave the container ajar or hanging off the side for the snake to crawl in. Duffy