Where did you find Maria Feiler's ship manifest of 1900? There is an arrival record of 1900 at www.ellisislandrecords.org
, but this is of a Marie Feiller, age 12, from Körtvelyes. This place might be Eltendorf near Poppendorf, but it would not be Poppendorf.
What is the source of your statement that Lorenz Kreinecker was Maria's half-brother? Does your husband or his family have a document indicating that?
Could you scan and post the document about a money transfer in 1906?
You need to sort and document what you know, so that we could come up with suggestions for your further search.