How many orders has Aimee Bixby made?
Aimee Bixby made refers to "Customer Name" = 'Aimee Bixby';
SELECT COUNT(DISTINCT T2.`Order ID`) FROM people AS T1 INNER JOIN central_superstore AS T2 ON T1.`Customer ID` = T2.`Customer ID` WHERE T1.`Customer Name` = 'Aimee Bixby'