The TARDIS bounces around through space and time, landing here and there so the Doctor can investigate this mystery, or solve that problem, save a world or battle an enemy. There’s always somewhere new to go, another wrong to set right.
So wherever they travel, she waits, quietly, patiently, until the Doctor does whatever he came to do. It’s fine, she knows it has to be this way, he has responsibilities and it’s her role in life to help him any way she can.
But for her, the best part will always be in-between times, and the freedom of flight.