I hadn't looked into that much actually mostly because the main thing my wife can't see is the rings on the map and the enemy AoE ground markers which I figured couldn't be changed through the UI. But thank you!
Edit: I actually have been unable to find a way to change the color of the UI outside of the chat font colors and displayed name colors.
Sadly color blind addons are very rare and while they do exist I have yet to see any that add color filters. Filters are the most useful as they add ad color overlay that allows the player to see changes to the entire screen. Not just the UI but the game too, including other addons.