the saga continues........

After getting my Deckert;s ratsnake and anery, all was going well, feeding well, shed, in small plastic tub setups on papertowel substrate. So well that I got my problem baby, Diamond Lil at the end of November from the same source. Was told she had been feeding well and was shown a non-feeder that was being kept back. She looked healthy and weighed 12 grams.
She regurgitated her first 3 pinkies with me, so e-mailed Kathy after getting bad advice from another forum (had been told to wait not more than 4 days before feeding) followed Kathy's advice and used grapefruit seed extract and Lil fed twice successfully.(THANKYOU KATHY!) Then Lil went on hungerstrike, refusing to eat from the 22nd Dec.
Took her back to the shop on 11th Jan, and she ate that night at the shop, again the next week, so waited another week and brought her home on 25th Jan.(shop owner breeds as well as imports and is being very helpful)
She has not eaten at all, am near to despair for her. Temperature is perfect (digital in-out thermometer) She has papertowel substrate, papertowel-roll hides, she drinks and is still alert and active, but totally ignores the f/t pinkies offered. She weighs 10g (at lowest point went down to 8) and am totally stumped on how to help her.
Ratsnake and hypo are yearlings, both feeding well, anery @ 8 months, feeding well, reverse okeetee and carolina are babies, feeding well. Have no access to lizards except my son's leopard gecko so no lizard scenting possible, tried the tuna water, no interest, tried braining, no interest, after reading post on here tried chicken skin scenting, no interest.
Please help us, am aware Lil may have problems I can't overcome and it may get to the point where i have to consider euthanasia, but at the moment am just about ready to try anything while she is maintaining condition and weight I can't give up on her.