Patrick, I love your perspective, and thanks so much for a thorough answer!
About the young soils though, my place is beneath 1000 foot high sandstone cliffs, much of the soil is sand from that formation. Does it count as "young" if it was rocks which became very fine primarily quartz sand which was compressed back in to sandstone, with enough iron to stain it red, and I don't know what else. There is a very little clay in the soil, and one tiny "ridge" of a white colored clay, maybe bentonite.
My older doe, the one in question is actually showing some improvement, more fat between the ribs, sleeker smoother coat, with some undercoat coming on. She is definitely bloomier than when I got her a year ago. I will check her mouth. I don't know how long a doe can have a productive life, but I had been thinking that if she doesn't cycle this fall, or cycle in an obvious enough way for me to detect it, that she could benefit by a year of R&R. I would like to have another doeling out of her, if possible, but I'll have plenty of milk next season if all goes well with the other three. I have bred to bucks from another pastured goat dairy who feed even fewer concentrates than I do, so I'm hoping that her doeling from this year will do well on pasture, maybe not be as big a producer as her mother, but I don't really need her to make that much milk.
So, for now, perhaps I should double the older doe's ration of sunflower seeds at milking time, and make sure when I am handing out peanuts she gets twice as many as the others.
I'm planning to quit milking by the end of the week/month/year

. I am wanting to get just one more 5 # wheel of manchego type cheese into the aging room before I quit.
Thanks again for your help.