By pure coincidence, at the same time the movie came out, a local author came out with an incredible biography of Beatrix Potter: Beatrix Potter--A Life in Nature, by Linda Lear
We have a wonderful nationally-known independent bookstore in DC called Politics and Prose. It is in an old building and when you walk around the old floorboards creak and dip throughout the store. The sales staff are incredibly knowledgeable and helpful. They also have author readings that are broadcast on C-Span. I'm very lucky to live about 10 minutes from the store. I went to three different author talks in a span of two weeks in January and one was Linda Lear talking about researching for her book. Beatrix Potter was truly a remarkable woman. She was a naturalist and an enviromentalist without any formal education. She didn't just draw and paint cute bunnies, ducks, and hedgehogs. She painted and studied all manner of flora and fauna of the english countryside. She was also a feminist and didn't marry until her 40s. Then, as most know, she bought up many farms in the Lake District that were being parceled off for development and kept them as working farms and bequeathed them to the english trust for historic preservation (I'm not sure if that is the actually name of the organization).
I bought the book after the author's reading January and started it but work got in the way. I've just now picked it up again and highly recommend it.