That's good to hear. I was hoping they did a full OHE. There's really no reason not to and with what you described/showed us....it was the smart thing to do.
I'm also glad to hear they made sure she was given a true pain med as well as the standard anti-inflammatory. We have come a long way in that area of care for the animals. Back when I first worked for a vet in high school in 1990...that just wasn't done much. There were not a lot of good pain management options on the market for animals back then. Now we even have excellent long acting drugs for the rodents in the lab. Better living through chemistry for our furry friends!
I hope the biopsy shows it to be benign, and that she can get back to hunting with you soon and for many years to come. At the age of 4...she is just getting going!