Does she have free choice hay in her pen? loose mineral all the time.?.baking soda..?
maybe try adding a bit of calf manna, beet pulp and BOSS to her grain ration...she might like the smell and taste...
B complex helps both appitite and energy levels
I have an old doe that I am trying to get weight on too. I would pen her separately at night, so that she could eat all her food, instead of the other goats stealing it. She wouldn't touch it. I finally threw her in the pen with the others, and she walks over to their feed and starts shoving them out of the way! She gobbled down the feed once she got her head in the bucket. So, I found out that she eats great.....so long as she can fight for it!
I had a doe that i got from a breeder who had raised her from a baby and i got her when she was about 4 years old. I would feed all of my goats and she would stand off to the side so i just thought maybe she dosent want to fight for it so i put her in a pen and tried to feed her by herself but she would eat a little then walk away i thought she was sick or something but the next day i tried to feed her again by herself but i had just poured out some feed for the chickens (dry pellets) and she left her feed ( dry pellets with some sweet feed mixed in) and went and tried to eat the chickens.
Found out she had been fed dry pellets all her life and didnt like sweet molasses in her feed. So now i have to fix her feed different from everyone elses. Haha.