cows uterus

i hope this is the right place to put this if not Dave plmk ok?
i just got word that we have a heffer that has had a calf before and just had one and her uterus came out with the calf.has anyone ever heard of this happeneing,she isent dead yet but on the way,dr said he cant do anything for her,so my fil is talking about putting her out of her misery because she is suffereing and the vet says he cant save her anyway.i just wanted to know if anyone else has went through this and ho/why does it happen? the calf died as well was born dead so now we have lost 2 of them in just one day i am so sad,i love to se the calves run and play in the pasture and tis one wont get to. we had to bottle feed calves before and i didnt care for it but i know i would have this time if i had too. but no such luck . please if anyone can help me to understand this i would really appriciate it thxs
moretz