She may of been slammed by another goat or may of picked up an aborting disease. There are a few things, as to why they abort, but only testing the fetus will determine what it actually was.
With Ivomec, it is 1cc per 33lbs orally, then 10 days later, she was underdosed if she is 118 lbs.
With Bo--se, it is best to give less, then more because overdosing can kill her, so 2 cc's was OK.
What antibiotics did you give her? You might be underdosing her there to, unsure.
Does she smell bad in her vulva area, if so, it is infection, do a sniff test. If not it may be pneumonia.
I agree to get a fecal for cocci and worms.