There are a multitude of synonyms for the phrase "explain her success." One could describe the tactics or strategies used to achieve success, such as detailing her methods or outlining her approach. Alternately, an explainer might focus on the qualities, traits, or attributes she possesses that led to her success, such as her skills, talents, or intelligence. Her background, education, or experience could be contextualized as contributing factors to her achievement. Additionally, a writer could highlight the myriad benefits that she enjoyed, including support from others, strong networks, or a favorable industry environment. Ultimately, any or all of these perspectives could be used to shed light on the reasons behind an individual's success.