Hi, thanks for writing to HCM.
The most feared complication of even a minor head injury
in ELDERLY person is an INTRACRANIAL HEMATOMA
which could be Epidural, subdural or Intra parenchymal ( within the brain substance ).
The symptoms may not appear immediately in all cases. They may present within a day of injury or may appear as late as 2-3 weeks.
The common presenting symptoms are - increasing headache, vomitings, drowsiness
, confusion, weakness in limbs
on one side of body, progressive loss of consciousness
If your mother experiences any of the above symptoms, you have to act swiftly and should consult a neurosurgeon for further management.
Hope this information is helpful. Good day