Both the original surgery and all subsequent efforts failed to eradicate the systemic MRSA infection she had. It was acquired as a hospital employee (strain matched to her place of employment), but apparently dormant until it attacked after surgery. It go so bad it damaged tissue and bone, so no possibility for a revision. There is apparently no way to eradicate it - it popped up again after dental surgery, and she had to have dentures instead of the planned implants.