So many people find their way to this site only after such terrible news.
I can't add much advice to what China already said.. . only that these dogs are VERY stoic about not showing the pain they are really in, so the good pain meds are a must, and keeping a very close eye on her for when she does give you signs she has had enough.
The cancer in the bone does weaken it and make it prone to fracture, so letting her run or jump on and off things (assuming she wants to) is probably not a good idea. Low carb diets are best, as the cancer feeds on carbs. There's some info on that here if you do a search.
The biopsy may actually make the cancer spread or grow faster...