I tired to use the "character creator" in the new game screen at first, but ran into an issue where the only way to get Aisling into Dermot's court was to marry her outright.
After that, I loaded up a mod called "Daddy Pika's Cheat Menu" which allows the player to access the character creator during gameplay. (not normally possible) I found a wandering girl in Ireland and used the character creator to copy Aisling's design onto her.
From the few hours of gameplay I've got in CKIII, albino characters are exceptionally rare. Getting one with a positive congenital trait (such as beautiful, intelligent, or strong) is even less common.