Write SQL query to solve given problem: How many events have happened on the device of the youngest female user?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT COUNT(T1.event_id) FROM events AS T1 INNER JOIN gender_age AS T2 ON T1.device_id = T2.device_id WHERE T2.gender = 'F' GROUP BY T1.event_id, T2.age ORDER BY T2.age LIMIT 1