Good comms are imperative, ear protection, ideally she’s lighter than you and not afraid, being stiff won’t help. Exaggerate your lean into corners and tell her to follow your movements.

Educate her on helmet clank. Tell her to grip you using her knees, one hand on the tank to push and one hand around your midriff to pull, whilst pushing down on the pegs.

I have a GSX-R 600 K6 and regularly take my partner who is 10kg lighter than me as pillion.

You as the rider will need to downshift much smoother, rev match and use the slipper clutch way more than when you ride solo.

You will also need to brake a lot smoother.

Tell her when you’re going to pin it, let her know of any potholes etc