Photato(Photogenic Potato) refers to someone that looks good in a photo, but looks ugly in person.
She might be someone with a small face, or a slim body, or someone who is relaxed with the camera. All those factors could make her look more beautiful in the photo than she actually is, which makes us jealous.
That girl is such a photato. If only she was as good looking in real life, as she was in her Facebook photos.