Poor baby...hoping she heals asap
If it was one of our dogs, I wouldn't feed any bone at all until they've recovered 100%. In the meantime, bone meal and/or crushed eggshells can be added to meat and organs. I most likely wouldn't be feeding any bone other than soft bone, eg. chicken carcasses (but not on it's own... at least 75% meat with it) and chicken necks. I no longer feed wings or legs/thighs because two of our guys are already having a difficult time digesting them; I would imagine it may be risky feeding it to your parents' dog as well.
Lots of good healing vibes being sent her way