Slayers Evolution does follow the light novel to a great extent. The overall story arc, the main characters' personalities and their relationships are quite in line with what is described in the light novel. For example, the adventures of Lina Inverse and her companions are depicted in a way that stays true to the source material. But, of course, in order to make it more engaging for the anime audience, some parts may be adjusted in terms of pacing or visual representation. It's a common practice in anime adaptations. The anime manages to capture the essence of the light novel and bring it to life with its own unique charm.
Mostly, it does. The light novel serves as the foundation for 'Slayers Evolution'. The basic plot, such as the magical quests, the battles against dark forces, and the comical interactions between the characters, are all derived from the light novel. The anime also retains the unique magical system and the world - building concepts from the novel. However, there are some deviations which are mainly for the sake of brevity or to enhance the visual impact. For instance, some of the more complex internal monologues in the novel might be simplified in the anime to keep the story flowing smoothly. But overall, the connection between the anime and the light novel is quite strong.
Yes, it generally follows the light novel. There are many plot elements and character developments in 'Slayers Evolution' that are based on the original light novel. However, like most adaptations, there are some minor differences and creative interpretations to better suit the anime format.