To be fair, Gail Simone made it very clear that she has an “unusual pov” of the film, because she was “fiercely protective” of the characters when she was writing the series. She said she fought against any “off-model” portrayals of the Birds of Prey girls, even if they occurred in crossover issues. Gail Simmons said that she’s carried that protectiveness with her and, because of that, she understands when fans want adaptations to be like the comics.
Article source: https://www.cinemablend.com/news/2489882/birds-of-prey-comic-writer-major-gripe-with-the-movie-cassandra-cain