You've provided an accurate definition of the idiomatic phrase "down to earth." The sentence you've given effectively demonstrates its usage by describing how Alex's practical and realistic approach contributes to her success as an entrepreneur. If you have any further questions or need more examples, feel free to ask!

I would never use down to earth as you have. Synonyms are demure humble lowly meek modest unassuming unpretentious Example: the celebrity surprised me because he was a regular, down to earth guy. He liked hunting, fishing, sports, and beer.