According to records left in the lunar cities, she was an input mechanism for managing the planet more efficiently. Apparently they treated the planet as a life form of its own, and isolated its soul into a silicon-based body. It says “soul”, but presumably they meant “brain”. Planets have parts that you could call their “body” and “heart”, but no such organ as a “brain”. The scientists on the Moon had created an artificial brain, and a command body to go along with it with which they could control the planet as they pleased.

Tsuki no Sango