Dani,
I can't give you any insight into the bone infection question, since I didn't experience that. However, on the subject of how different your mom's mouth feels, I can understand that. As you start to wean yourself off of pain medication, you begin to feel more areas that are still recovering. Some of them stay numb for awhile and then gradually develop sensation over a long period of time. Also, there can be tightness where the surgery was done. Finally, you have to get used to using your mouth differently for eating and speaking over the long term, depending on what works best.
It can be a series of major adjustments, but hopefully she's on the way to recovery.
Cathy