After a female nurse experiences a needlestick injury, what is the most critical action she should take?

The most critical action after experiencing a needlestick injury is to seek medical attention right away. This step is vital because immediate medical care can reduce the risk of infection and manage any potential exposure to bloodborne pathogens.

Following a needlestick injury, washing the area with soap and water is important and should be done promptly, but it is not sufficient on its own. While informing the charge nurse and completing a work injury report are also necessary steps that follow, they should occur after urgent medical attention has been secured. Getting medical evaluation can lead to appropriate post-exposure prophylaxis if needed and is crucial for the nurse's health and safety.

Therefore, prioritizing medical attention is essential in this scenario.