If I hadn't researched this on the web, I would've never believed that this was real. But, it is, and it's a sad and bizarre story. Oxana is a Feral Child. What are Feral Children? Here's the definition from FeralChildren.com:
Feral children, also known as wild children or wolf children, are children who've grown up with minimal human contact, or even none at all. They may have been raised by animals (often wolves) or somehow survived on their own. In some cases, children are confined and denied normal social interaction with other people.