Good to see that image. I think you might have read the weight wrong as there is no way the GTP from that image is 17 grams. It also is not underfed. If anything it is doing well and can handle the lack of eating for a bit.
Follow what Sauzo said about feeding and water. They respond best to prey offered in front of them on the perch and allowing them to "hunt" it. Ganja wants her prey slowly moved toward her head and takes about a minute or two before she shows interest. It is important not to just offer and give up. It can take several attempts before they strike and coil.