first I just want to say sorry for your loss. And second I am not by far an expert or and experienced breeder. I do own a 6 month old gtp I got from my best friend that does breed and I am writing to say what I've seen him do for picky eaters. I've never seen or heard of him force feeding but that but that may have to be an option. What he usually does is give the what they are used to in the wild, geckos or frogs wild they are neonates. And with that he'll just put them In the cage and a couple days later they would be gone. He's also made a paste from geckos and dipped pinkies in it just for the smell and gradually cut back. He also feeds at night because they are nocturnal and hunt at night. Hope this was helpful and if I'm wrong anywhere I keep an open mind and can always learn more.