Had the same thing happen to an 10 yr old cow. A couple months after she gave birth, we found her down & she lost the use of her hind legs this last winter. We used the tractor several times w/ homemade rigging to try to get her up, but she couldn’t put any weight on her hind legs. We then moved her up to the house & corrals to feed her out. She never really lost her appetite & would slightly reposition herself almost daily, thus giving us hope but our expectations were tempered. Mainly fed her free choice hay & alfalfa cubes. After 3+ weeks, she got up on her own & we moved her into the corrals for another several weeks so we could keep an eye on her. She is now back with the herd & doing good.