Elle Woods isn't rooted in reality. She was made up by the writers to bring an engaging and fictional narrative to the audience. There's no real-life counterpart for her.
It's very unlikely that it's available for free legally. Most novels are protected by copyright, and authors and publishers need to make a living from their work. So, you'll probably have to purchase it from an official source like an e - book store.
Sort of. While the core of the story in Dark Waters has roots in real-life incidents, some elements might have been dramatized or fictionalized for cinematic effect.
Grace Waters is purely fictional. The story was made up by the author's imagination and doesn't draw from actual happenings. There are no real-life equivalents or inspirations for it.