Language as we know it, is human. The Dalek's limited vocabulary suggests that they were once exposed to human language or were once human. The Dalek's world is limited by its primary purposes to kill enemies and achieve world domination.
Even at 45, Rich must defend her reputation. As she filters it through what would have been her acquired Hindi: “I have not been bringing men up to my room. I have not been throwing condoms onto people’s roofs.”