Re-evaluate. Mesenteric adenitis is a benign inflammation of the lymph nodes which follow the blood supply of the bowel. Symptoms can include right lower pain, and can be confused for appendicitis. If this diagnosis is made, and symptoms persist for more than 5-7 days, you should have the diagnosis re-considered. Good luck.
Continued patience. You should consult with the child's pediatrician to look for other causes of the pain. If the original diagnosis was based on a ct scan, then it would depend on how convincing that scan was. Persistent lymphadenopathy would raise concern of another diagnosis so I would continue to follow up with the pediatrician.
See your surgeon. Es enteric lymphadenitis may be confused with acute appendicitis.