Humans with albinism don’t have “red eyes”; without pigment the human iris is blue. The “red eyes” image comes from albino lab rats. Their little eyes have very large pupils; so instead of seeing the iris, most people see the reflection of the blood vessels in the eye. This causes the rat’s eye to appear red in color.
Priscilla’s skin is a lot more pale that Kida’s, but they both do have white hair and blue eyes. Those features are actually indicative of albinism, a condition that causes a lack of pigment production in the skin, hair, and eyes of an individual. Priscilla’s albinism causes her to have sensitive skin and mild photo-sensitivity, so she tends to avoid bright sunlight. Her character illustration in the game shows her outside at dusk, a time she rather likes since she can go outside without worrying as much about sunburns or bright lights. She may also need glasses in the future if her astigmatism worsens, but for now she is able to get by without needing them.