I would not get overly concerned yet, but just make sure all environmental issues have been addressed. Enclosure temp. gradient 80 to 90 degrees, dark hide box, cage in an area of little disturbance, etc. The dark hide box is very important for newborn greens to feel secure. See my Sept. 17 response to your Sept. 15 post on this forum. I would resist the idea of force feeding except as a last resort. I would try a small rat dipped in chicken broth at this point if you haven’t yet. Mice are usually not a good choice for greens as many don’t care for them. I don’t remember if you have tried f/t chicks yet, but it sounds like that would be the next good choice at this time if the chicken broth fails. I don’t know if you have access to any, but live chicks are the top pick for young greens as very few can resist them. Also, it is best to feed in the evening shortly after lights out. Usually once a young green starts feeding, they are rarely a problem afterward. Good luck and let us know how it goes.
Kelly