This sounds like 1 or 2 things or a combination of both. First, a rather remote possibility to pass by you. Chams can occasionally damage their tongue, either by overextending it (sort of a sprain), or by biting it unintentionally. It isn't that common, but can happen. Chams can learn to eat without extending their tongue, but it will take a while. If the tongue is damaged from a bite, check to see if the muscle is severed. If not, it will probably heal on its own.
The more common problems are nutritional deficiencies and losing muscle tone in the tongue because they feed out of a cup too long and don't have to hunt and shoot far.
Rule out nutritional problems...tell us what you gutload with, dust with, how often, and check your lighting (what brand, how old the bulb is). You can overdose as well as underdose calcium and vitamins.
Stimulate her to hunt and shoot free ranging insects in the cage. Crix just hide all day, as will superworms. Try houseflies. They are active when the cham is, tend to stay up high in the cage near the lights where the cham can see them. You can feed the flies in the cage by putting some fruit baby food in a bottle lid someplace where she can get near them. You can also give her more to hunt by getting the feeders out of a little bowl and letting them roam around in a larger plastic storage box in the cage. She will have to climb down to the rim of the box and shoot from there to reach them. That will help strengthen her tongue.
