The Rani's TARDIS
Unlike the Doctor's TARDIS, the Rani's TARDIS has a fully functional chameleon circuit, and can still disguise itself wherever it lands. It can, however, be opened with the Doctor's TARDIS key.
In Mark of the Rani, the Rani hides her TARDIS (disguised as a cabinet) behind a screen, and has managed to link it to, as the Doctor says, a Stattenheim remote control, which he describes as "genius". It is in this TARDIS that she and the Master get trapped with a gradually growing Tyrannosaurus rex embryo.
In Time and the Rani, her TARDIS appears as a reflective pyramid. She is eventually trapped by the Tetraps in her TARDIS.
Read more about this topic: Rani (Doctor Who)