The low milk production may signal low calcium levels, Hypocalcemia. Especially if she isn't eating well she isn't having the calcium levels she needs. She may need some CMPK. Injectable is best but here is a oral recipe also I thought I'd put out there.
http://www.dairygoatinfo.com/index.php?topic=27.0 As a reminder, Hypocalcemia and ketosis can go hand in hand. Once eating is low both can strike.
When my doe had mucus in her stool, worming for Liverfluke took care of that.
How is her eyelid color? Unfortunately worming for liverfluke costs about 38.00 to get into a wormer that covers that, Valbazen or IvomecPlus, so many don't get it, if only having a couple goats.
I would give lots of support also. BO SE, fortified B's to ward off Thiamine deficiency since eating is low, Pro Bios, electrolye water, vitamin C. Offer baking soda and keep her hydrated. No sweet feed, especially if she isn't used to it. Good grass hay and free choice alfalfa pellets, offer dry rolled oats.
Of course the tramatic kidding and pain could have caused the low eating but then support is needed to head off other issues that can arise.
Just some of my thoughts, I hope she gets better soon.