That’s the whole reason they attached it to her foot.
The damage to her scalp and vascular network was so severe that restoring the ear at the time was impossible, so the procedure was performed to save the patient’s aural orifice so it could be reattached to her head later.
Maybe they’ll be able to graft the ear back on her head before she’d be healed enough to walk out of the hospital anyway.
That’s the whole reason they attached it to her foot.