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.