It isn't uncommon for upside down breech births to die. During the birth the calfs head is still inside the cow and often the cord breaks, which stimulates the calf to breathe. The calf often drowns / smothers.
If your cow is fantastic in every other way and you decide to keep her, make sure and breed her to a bull that throws extremely good udders, as you want any heifer she has to hopefully have a better udder than she has. Even if you don't keep her heifers you want to improve the breed gene pool in your area. Take a look at some of the dairy breeds and what has been accomplished in the udder "department" by generations of careful breeding. A good portion of cattle in dairy herds are not purebred either, or at least not registered, as many have been bred back for generations to P.B. bulls.
For many years in our area it was a big joke concerning whitefaced cattle, that they had not so good of udders. Now I am starting to see changes and improvements in the udders of the breed over all, due to the diligence on the part of some cattlemen / women and their breeding practices, so it can be done.
If you can't graft a calf on her, try and dry her off. If her udder gets extremely, extremely tight, you might have to relieve a bit of pressure, but if drying her off, don't milk more than a tiny bit out to relieve a tiny bit of pressure as milking her out stimulates milk production. You may have to watch for watch for mastitis,-- inflamed abnormally swollen udder, clumpy, stingy milk.
Will she let you milk her, or will she have to be restrained?
Hope things improve for you..
Nite Hawk