for what ever reason i have a first calf heifer that had a calf and everything was going great. She was getting pulled down pretty bad so I pinned her up and supplemented her with young heifers. She still went down hill. Her calf up and died after about a month. Nothing appeared wrong with him. She wasnt giving much milk towards the later stage. Well she still kind of continued down after the calf died. she now is down and wont get up. i have been feeding her and haying her on the ground. i have put slings under her fron and back end and pick her up with the tractor. the front legs work but the back ones are either so stiff or just lack of use. When i pick her up i can move them around and she just doesnt seem to have control of them. i gave her antibotics and swelling shot. he is on day 3 to be down. Is there a give up point where if they are down so long the legs arent going to gain mobility again. She gets pretty weak when i pick her up and let he try to stand on her legs. Any suggestions