Tent test is to check for dehydration. Pinch the skin on the middle of her back ( finger on one side of spine and thumb on other side of the spine ) If the skin stays up like a tent, she is dehydrated, if it goes right back to normal she isn't.
Start opening your curtains in the morning to let more light in during the day, sounds like her internal clock is out of wack probably from the room being on the darker side.
The diet, is not a consistent one nor does it sound like its balanced and giving them enough of what they need. You might consider getting them on one of the well known balanced diets for their long term health.
Personally I don't feed crickets at all, there is to much of a risk for aflatoxins.
sprinkling calcium and vitamins isn't the greatest way to make sure their needs are being met. To much can be just as bad as not enough. That's why we use well known diets with measured amounts of calcium and vitamins distributed evenly throughout the staple recipe. There doesn't seem to be much protein in the diet you are feedin either.
Just because they haven't shown signs or symptoms of the diet not being enough, doesn't mean it is enough. It takes time, sometimes a couple years for diet related signs and symptoms to physically show, by the time they do it's usually to late to reverse it or help.
This is not meant to be mean in any way, it's only meant to inform you so you can do some research on diets.