I Ha E A Six Week Old Puppie A Min

I ha e a six week old puppie a min pin chauwawa mix the dad unknown .1st episode her head jerked from left to right
HOLDING it back acted dazed and confused. Last episode I went to work she was fine at lunch fine came home 3 hrs later she was non responsive gave her Karo syrup helped a little then she acted dazed and real confused. My vet said her spot spot had not grown together she probably hit it 1st time 2nd episode he said probably hit it and had mild to moderate brain damage