For Ms. Sweeney, who has diabetes, which action is prohibited?

In the context of care for a patient with diabetes, particularly concerning foot and nail care, trimming fingernails is often advised against due to the risk of cutting into the skin, which can lead to infection or other complications. People with diabetes may have reduced blood flow to their extremities and can also experience neuropathy, which diminishes their ability to feel pain. This makes any noticeable injury, such as a cut or nick from trimming nails, potentially serious.

Maintaining nail hygiene is still essential for diabetic patients, and cleaning under the fingernails, filing them, and soaking hands (with caution regarding the temperature and duration) can be safe ways to promote nail health without the higher risk associated with trimming. Thus, it's important to adopt safer practices that minimize injury while managing the risks associated with diabetes.