That's pretty much un-knowable because CDG has several runways aligned differently and 2 directions of possible aircraft travel on each, so it's just a crapshoot what can be seen from the aircraft windows. AirFrance does have a static display of a Concorde there and as one is shuttled from terminal to terminal (no love lost here for CDG) one can see lots of hardware on the tarmac if that's what you were wanting to see. As for views of the city, I don't think any large jet on departure is much of a sight-seeing vehicle unless one happens to be seated in the cockpit.
On your PS.: London has several airports, all some distance from the center, and I don't think you are likely to get a sight-seeing lap around the area prior to landing.
Your friend will enjoy the first trip to Europe, and if you are accompanying, it will be fun to see the look of discovery in her eyes.
PS, I like looking out windows too, but have learned that on long hauls, the aisle seats are preferable unless one is able to curl up with one's head in the corner and sleep.
Jim Ricks