May I suggest that when researching the parents of Amelia you take into consideration that the name could have been Kaestner? In German that would be the a with the two dots, umlaut, above it, which would be pronounced Kestner and could have been written that way just to simplify things in an English speaking country. Kaestner would be much more common in Germany than Kestner. This point could make record searching a bit easier. Best of luck.