Well that's not TRUE. People come in different shapes. Sometimes just having the reassurance that there's someone who loves you is enough. But sadly that's not the case with most. When you have no sense of meaning or purpose or something to ground you it doesn't matter who's around you or how much they cherish you. And she has felt like an imposter all her previous life and now that she's migrated Into a fictional story, and getting the love which was meant for Selina, it's hard to leggo of that deeply rooted belief about being an imposter. So yea, I think the author did enough research for this