A 58-year-old woman with a history of previous abdominal surgery 15 years ago presents with acute onset abdominal pain, abdominal distension, and bilious vomiting for 12 hours. On examination, she is afebrile with mild tenderness but no rebound. Plain abdominal radiograph shows dilated small bowel loops with air-fluid levels. CT abdomen with IV contrast shows a transition zone in the proximal ileum with collapsed distal bowel. There is no free air, ascites, or bowel wall thickening. What is the most appropriate next step in management?