Linda Woolverton knows her Disney princesses. After all, the veteran screenwriter worked on Beauty and the Beast, The Lion King, Mulan, the 2010 Alice in Wonderland and the Sleeping Beauty reimagination Maleficent, which arrives in theaters today. So she speaks from experience when she says that Maleficent, which stars Angelina Jolie as the titular villain, couldn’t have existed until this point in time — because the world wasn’t necessarily ready for such a strong, complicated female protagonist. When Woolverton worked on Beauty, she says, it was shortly after the arrival of The Little Mermaid; the Disney princess was well aligned...