Answer:
Since Mrs. O'Malley disenrolled form the plan because she was moving away to a location that was not served by the company, Agent Higgins compensation should not be affected.
If Mrs. O'Malley (or any other client) leaves the plan before the 3 month period because she decides to go back to her former provider since she doesn't like this plan (for whatever personal reason), then the company would be able to recoup Agent Higgins's compensation.