What is a suitable use of "difficulty" when discussing concentration issues?

The choice "She has difficulty with focusing" is a suitable use of "difficulty" in the context of discussing concentration issues. This phrase effectively communicates that the person is having trouble with specifically concentrating or directing their attention. The structure is clear and directly links "difficulty" with the act of focusing, making it easily understandable to the reader.

Using "with focusing" emphasizes the action or skill that is challenging for the individual, which is relevant here. It conveys a straightforward meaning while maintaining a natural and grammatically correct construction. This phrasing is commonly used in English to describe struggles related to concentration, making it a practical choice for the context provided.