Adults will eat when they are ready, I know how you feel though, I have an '07 pastel female and she only weighs around 800g, she is a very picky, on again off again feeder, and given that it's breeding season, I also have a couple males who are refusing off & on because of breeding season, so long as they are hydrated, keep offering weekly, they will feed again.
For a fresh import, i would leave completely alone, except for maintenance. Cover cage at all times, and offer food weekly.