Dear Abby: I think my sister-in-law is being scammed by her girlfriend

DEAR ABBY: My sister-in-law, “Carla,” has had a “girlfriend,” “Susan,” for the past year who she has never met or spoken to. They only text. Carla says they plan to be married when they meet, which is canceled repeatedly. When I have asked, Carla has confusing reasons why they can’t FaceTime or speak on the phone.