I have a heifer calf that was born last monday night in a driving cold rain storm. Don't know if she ever got colostrum. She got progressively weaker and on the evening of day 4 I brought her inside and gave her electrolytes and an antibiotic. I had to tube her because she wouldn't suck a bottle. On day 5 the Vet came and gave more antibiotics, and a selenium shot. He said to keep her on electrolytes only, and turn her back out with mom on monday when she will be a week old. That will be tomorrow. However, she still won't suck a bottle and walks like she's 90. Should I worry about that?????? Is this the sink or swim theory?