The developers made a choice not to include women in Outlast and Outlast: Whistleblower. Why? I'm honestly not sure, but I am sure they had good reasons. That still doesn't mean having no women featured in-game is any less odd.
Waylon Park's wife, Lisa, is mentioned a few times, and we know there's a Female Ward in the asylum, but since having been abandoned it's been left to slowly collapse on itself, and a couple female scientists are mentioned in documents. But no one is actually seen.