A 78-year-old woman with a history of hypertension and type 2 diabetes mellitus sustains a subcapital fracture of the femoral neck (Garden grade II) following a mechanical fall. She is brought to the hospital 8 hours post-injury. On examination, the affected limb is held in external rotation and slight flexion. Plain radiographs confirm a non-displaced intracapsular fracture. Which of the following is the most appropriate management strategy for this patient, considering her age, fracture pattern, and the risk of complications?