If she eats well, you can add a lot of water to her food. Chicken feed with some water is the best for her, and then try the other foods just a little at a time to tempt her. I will even sprinkle some bits of crumbles on food if they stop eating, to get them excited. Electrolytes are probably not needed unless she is not drinking enough fluid. Only give her 1/2 of the B complex tablet daily. 1/4 is plenty, but it is hard to break a tablet into quarters. You can play around with the sling. Sometimes the feet can touch the floor, but if it she tries to escape, sometimes suspending them above the floor works better. I would contact the Vetdna website just to ask how to get the blood serum test at home. Several BYC members have gotten that test done, and for $20, it would be something to tell you whether or not this is Mareks.