I don't personally know if she makes a profit or not, but having done the math a few times on her sheep operation, I can't figure out how you could make a profit given the stuff that she does; the description of hiring a vet to do surgery on an old ewe was one that made me shake my head, but that's what she chooses to do with her livestock, and more power to her.
The entry that I read today talked about her livestock guardian dog bronte getting diagnosed with bone cancer, and in that post she talks about all sorts of heroic measures that she could use to save the dog. Radiation, medication, amputation, and this for a dog that she says in the entry she's not going to miss very much, at least compared with the house dogs.
On some level I guess it's laudable to spend any amount of money and time trying to save every single animal you own, but it's not very common among livestock farmers that operate their business with the goal of making money.
I too have stock dogs, and they do indeed get the standard range of injuries and illnesses that stock dogs do, and we do patch them up and send them back out pretty regularly, but with a terminal illness diagnosed, I'd be hard-pressed to spend much money at all.
I'd watch the dog carefully to make sure that it's still having a good time, able to get around, enjoying its time on this planet, but at the point at which it was clear that it wasn't, well, I'd shed some tears and put it down.
This is true of all of the livestock that I keep; if a cow has difficulty calving I'll look carefully at culling it; if a pig isn't a good mother, well, there's a reason you're here. It's a hard line to keep sometimes; particularly with animals that I've had to bottle feed because of some issue and knows and likes me. It's nothing personal, and it's tough.
I have to say that it has gotten easier over the years, but there are times when I read something like this and I wonder if there's ever the realization that there is another way to handle this.
Folks who don't do livestock tend to cheer people who do heroic measures. But I really question sometimes whether the heroics are for the animal, or the owner.