"She is not proficient in English" 是一个简洁的表达方式来说明她不擅长英语。为了更详细地描述这一点，我们可以扩展这个句子，并提供一个具体的案例来进一步说明情况。
扩展描述： "She lacks proficiency in the English language, which often hampers her ability to effectively communicate, understand complex texts, and engage in nuanced conversations. Her struggles are particularly evident in situations that require advanced vocabulary, grammatical accuracy, and rapid comprehension."
案例说明： "For instance, during a recent international conference, she was assigned to present a research paper. Despite her thorough understanding of the subject matter, her limited English proficiency became a significant obstacle. She found it challenging to articulate her ideas clearly, frequently pausing to search for the right words. Additionally, when questions were posed by the audience, she struggled to comprehend the nuances and respond appropriately. This not only affected her confidence but also made it difficult for the audience to fully grasp the importance of her research. As a result, the impact of her presentation was somewhat diminished, highlighting the need for her to improve her English skills."
通过这样的详细描述和具体案例，我们可以更全面地理解她在英语方面的不足及其在实际情境中的影响。这不仅有助于明确问题，还可以为制定相应的改进措施提供依据。