Thanks for your advice mate, appreciate it! Next mission is to have this conversation with her so will be reporting back to you!
I would lean toward a ''beauty dish reflector'' than a flash. Of course if she doesn't have one, how about a Nikkor 135mm f2 D lens, also available in 105mm f2 D.
Thankyou! I'll look into this. Appreciate it
If she already has a good speedlight, a reasonably fast normal zoom (24-70/2.8) and a fast telecom (70-200/2.8), a flash bracket might be the most useful thing you can get her. The problems with fast primes for weddings are that they are fixed in focal length, so one needs to move around to get the framing one wants and the depth of field is tiny when using wide apertures, so one usually has to close down to the f/2.8 region anyway.
Krag, the DC lenses are very specialised tools and the D850 tends to reveal some CA as soon as the DC ring is moved from the idle position. They suit more controlled environments better than the constantly changing conditions during a wedding.
Thanks Merco! Will look into this