At the heart of all great detective stories is a great Detective (or group of) and thus there is an ocean full of novels, short stories, films and TV series to crawl through to find inspiration.
Luckily for me I write from a character stand point. That is, no character, no story. So when I got this idea it came generally from the idea of who the main characters were or could be, which means I could be very specific with the types of Detectives I look at for inspiration as well as techniques on who to write the development of such characters.
Two main things I know for sure: She is not you regular detective prototype. 2. She is a She.