The most appropriate action for an internal auditor who realizes that she has undertaken limited training and professional development is to accept responsibility for her own continuing professional development, develop a professional plan, and discuss it with the CAE. This proactive approach ensures that she meets the ongoing professional development requirements, aligns her training needs with the objectives of the internal audit activity, and maintains the necessary competencies to perform effectively in her role.
Institute of Internal Auditors (IIA) - International Professional Practices Framework (IPPF)

In situations where the internal audit activity lacks specific financial accounting knowledge for certain audit projects, implementing a guest auditor program is a strategic approach. This program allows the organization to bring in external experts or auditors with specialized knowledge on a temporary basis to address the specific needs of the audit. This approach provides the required expertise without the long-term commitment of a full-time hire, ensuring flexibility and immediate enhancement of the audit team's capabilities.
The IIA Standards: Standard 1210 - Proficiency: "Internal auditors must possess the knowledge, skills, and other competencies needed to perform their individual responsibilities." IIA Practice Guide: "Guest Auditor Programs": Discusses the benefits of bringing in external experts for specialized audit needs.

The Mission of Internal Audit is to enhance and protect organizational value by providing risk-based and objective assurance, advice, and insight2. One of the activities that the internal audit activity performs to fulfill this mission is to conduct reviews of internal risk and controls, which means evaluating and improving the effectiveness of risk management, control, and governance processes in the organization3. This helps the organization to achieve its objectives and mitigate its risks.
References:
1: CIA Exam Practice Questions - Certified Internal Auditor 2019 2: Mission of Internal Audit 3: About Internal Audit : What is Risk Management in Internal Audit - ESG | The Report

A whistleblower hotline is part of a fraud detection program. Whistleblower hotlines are critical as they provide a confidential means for employees and others to report suspicious activities or concerns about fraud, thereby aiding in the early detection and investigation of potential fraudulent activities within an organization.
IIA guidance and fraud risk management frameworks that identify whistleblower programs as an essential element of an effective fraud detection system.

In a small organization where management cannot achieve adequate segregation of duties for its cash- handling procedures, installing hidden surveillance cameras to monitor these activities is an example of a compensating control. Compensating controls are alternative measures implemented to mitigate risk when primary controls (such as segregation of duties) cannot be fully achieved. These controls help maintain security and oversight despite limitations in the control environment.
Internal control frameworks and best practices.