I have had a gecko as thin as yours. she just wouldn't eat!!! We tried rescue formula and little crickets for weeks. We spent alot of money on her, even went to the vet and tube fed the gecko. All you can do is try your best. Offer food frequently, even try a little bit of gecko formula on your finger. See if it will lick it off. That might stimulate it to eat. I hope this helps!!!!
Thats a shame. im trying to bring one back, its about as skinny as the one yours was. Its eating more and more everyday. Sorry for you loss, at least you gave it some love and care.