A PR expert declined an offer to become Kate Middleton's private secretary.
Alison Corfield was offered the position but chose to stay under the radar.
Corfield was uncomfortable with the high-profile position.
She remains an integral member of the campaigning team.
Hannah Cockburn-Logie, the princess's last private secretary, stepped down for personal reasons.
Cockburn-Logie was described as one of Kate's most reliable allies.
The hiring process for private secretaries is usually different.
Aides are typically hired from civil service and government ministries.
Kate is still looking for a new private secretary.