How should one control bleeding from the nose (epistaxis)?

A) Instruct her to compress the nose between her fingers.

Rationale: The recommended action to control bleeding from the nose (epistaxis) involves instructing the patient to sit up straight, lean forward slightly, and then compress the nose between the thumb and index finger. This direct pressure helps to reduce bleeding from the site and promotes the formation of blood clots, which stops the bleeding. Leaning forward and sitting upright are important for preventing blood from flowing down the throat, but the direct pressure on the nose is what stops the bleeding.

The final answer is $\text{A}$.