Tosh was unconscious in a cabinet on Lakertya. Unable to break free, the only thing Tosh could do was think. She knew through overhearing her captors the Rani wanted to mine the brains of geniuses to make a time manipulator.
The Rani was a Time Lady and a mad scientist. And yet, the Rani's name could be translated as "queen." Why the Rani didn't go by "the Scientist" was beyond Tosh.
Tosh wanted to talk to the Rani after she was freed. Instead, Tosh was lead into the Doctor's TARDIS. Instead of answers, she prepared to prevent a time paradox.