Friend has a 15 month old heifer, she's been in with the bull almost her whole life. Last night she was having trouble walking and was weak in her front end. She was lifting her front feet really high while she was walking. She walked 2/3 of the way up a really steep hill and she laid down this morning she was laying on her side head back eyes staring but not moving legs straight out. After giving her a full 500ml bottle of Calcium and Magnesium for cattle. She started blinking lifting her head and looking around and twitching her ears. She's still having trouble controlling her legs, getting them under her. She's currently propped up so she doesn't lay flat. Guy they talked to thought she may have milk fever and or be low on Magnesium. She doesn't have an udder, she is very round in the middle. Owner doesn't think she is pregnant. She was a bottle calf she is about half the size she should be for her age. Any advice?