Sorry about Betsy. Is she the Jersey you bought last year? I thought the Jersey was a younger cow. Or is Betsy the Longhorn? Either way, a big loss to you.
If Betsy is the Jersey, Milk Fever could be why they sold her at the end of her last lactation. At least you got a heifer calf from her but a shame you can't raise a couple more on her. As well as the hassle of bottle feeding another calf.