Write SQL query to solve given problem: List out all the observation information collected for the patient named Bella Rolfson.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT DISTINCT T2.DESCRIPTION, T2.VALUE, T2.UNITS FROM patients AS T1 INNER JOIN observations AS T2 ON T1.patient = T2.PATIENT WHERE T1.first = 'Bella' AND T1.last = 'Rolfson'