The phrase "she is addictive" indicates that her personality and the unique blend of these qualities have a captivating and alluring effect on others.
In essence, the quote celebrates the multifaceted nature of a woman's personality. It recognizes that she can be both sweet and mischievous, which adds to her charm and appeal. It playfully acknowledges that complexity in a woman can be intriguing and captivating to others, making her "addictive" in a sense of being irresistibly interesting.