I had this same situation for the first time this year. Also a yearling first-freshener. She is a very friendly goat, both to people and other animals. When the baby came, it was a tough delivery (large single doe) and she was simply overwhelmed and a bit traumatized by the experience. I did what I learned here and other places:
Supplement mom with typical after-birth items to help give her energy.
Put afterbirth all over kid and kept presenting her to mom to lick. Mom would lick me, but not kid at first.
Kept mom from butting or stomping kid (thankfully she never tried the latter).
Held baby to nurse several times (if I couldn't have done this, I would have milked mom and bottled baby).
Milked mom and saved excess colostrum.
Put mom and baby in a very small pen and leave her be (but supervise so she isn't hurting kid - I did this by monitor).
Eventually, the hormones kicked in and when I came back to check on them a few hours later, I found baby all clean and snuggled with mom. Now there is no issue whatsoever.