The story is difficult to grasp for now but it also looks worthing the try, in my opinion. Thank you for the translation!!!
By the way For what I got the main fact now it’s that she’s like a mule, that is the baby of 2 different species that for this reason can’t reproduce. So probably her mother, as a royal, can use magic, like probably her father as well. But he’s likely from a different species (like a fairy. That fairy guy seemed to recognise her somehow), so for this reason it’s supposed she can’t use magic at all and so she is considered a “useless thing”, a mistake and so on. But now it seems she could be an exception.