Summer has "pretty severe" mastitis in her right breast and a fever of about 106. The limping and right-rear leg favoring is impossible to diagnose until her swollen udder is resolved. She does not have retained placenta or uterine tearing or anything else regarding the pregnancy/birth.
The vet is leaving me detailed instructions, appropriate drugs, and a pat on the head for calling him ASAP. He said my "instincts were correct" that she was sick and not just depressed (bah!) and that with proper care she'll be just fine.
(And if you aren't following along with a program but are curious, Summer is the goat in my default icon.)