Two key words here - 'daughter' and 'first'.
One thing missing - how old she is.

I've done a lot of trips with my daughter as pillion, the first when she was about 15. (Although she'd been on the back for local dad's-taxi-trips for years).

To S of France and Spain. Then Portugal on another trip and then getting really out of hand with Moscow, Istanbul and beyond.
On a Ducati and Aprilia.

I'm sure you'll get all the up-to-date road-legal stuff, but there's an aspect that needs close planning if you've not aready got it 110% under control.....
Luggage.

My daughter's a walking clothes-horse/mannequin. Always has been always will.
And I took no account of this on trip No.1. To find she'd packed clothes for everything from daytime to glittering evening balls.
And hair-dryers and heaven knows what else are heavy.....

It was a lot of stress. I couldn't figure out why the bike felt so heavy until I saw, on day 2 or so, what she'd crammed and levered into her share of the panniers. Too late by then, but looking back maybe I should have forced her to jettison a load of it.

Trip No. 2 (hilly parts of Portugal) - she'd found a way of squeezing even more stuff in, ignoring the problems we had on trip No.1

Make sure you've got good control of what gets loaded.

My only consolation - I'm pretty sure I learned a lot about handling an overloaded bike on tricky mountain roads on those trips.
Every cloud and all that......

And travelling with your daughter is g-r-e-a-t.
(Especially when you book into a youth hostel, my daughter doing the talking, and the guy behind the counter says "and this is your boyfriend..."
Never saw her get so angry so quickly!)

Have a good trip.

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TTR250 - London to Cape Town