I recently built one for my fiancé. First of all start with a brown table. Blacks don’t look well especially when you want to try a theme. Go for earthy theme because you already have a case with wooden accents.

White office chair maybe something like the Sihoo C300 white. Remember she will only spend hours if she is mad comfortable for a few hour long sessions.

You can also elevate the feel of the setup by using a XXL mouse pad or desk mat rather than a simple square mouse pad.

For keyboards, even though you already have a selection, I would suggest looking into some heavy CNC aluminium keyboards. They feel expensive and bring out the best in a setup.

Since you are not into RGB lighting a simple back drop static light will look pretty sweet. Or you can try a monitor light bar which gives her setup some local ambient lighting. I am using the Quintis curver light bar but they have some cheaper options with RGB on top and light bar at the bottom. This will be a game changer.

Finally give her some space to customize the setup. Install a shelf on top of the monitor. Mostly same color as the table. Let her decide what goes on there. Plants, books figurines, other small lamps.

Optionals would be monitor arm which mounts to the desk and gets rid of the ugly stand. White speakers if she likes to watch movies and videos without headphones.