New Clue about Mary - When she Came to America !

New update to Mary Tyvaert:

I know that her 'adoptive' brother,
Denie Tyvaert came to America from Antwerpen (Antwerp) on, according to his passport application, July 1881

Mary was born 10 April 1880

So a clue I have now is, she was just a little over a year old when she came to Detroit, Michigan, USA Or she left and Denie left a year later, once his mother and father and siblings were settled in.

however, there is one for:
Octavia Tyvaert 10 Aug 1864
It is said on the passport application that he came on : 
August 15th 1880 - this date makes more sense. If Mary was born in April of 1880 and the woman gave her to the Tyvaert family and paid their way to come to America than it must have been in 1880.
 

Hopefully there is a passport application for Mary or Coletta in Belgium to help solve this mystery once and for all!