How do you know both instances of records you found are her?
Antonia/Antonija/Tonica are very common names as is MILOSEVIC.
The 1914 manifest states she is goint to her adoptive father in Hibbing MN.
Did she live in MN?
Also the manifest from 1914 she is 11 yrs old, which would make her birthdate 1903. This would be off by about 10 years
What document, other than a ship manifest, which gives a birthdate?
Also this 1914 manifest gives info re Naturalization which occured in INS District 25 in 1941. INS District 25 at that time was El Paso, TX Serving west Texas and Oklahoma, New Mexico
Did she live in that area at that time?
The 1912 manifest lists her as being born c. 1889 destination Eureka CA she is single and born at Lic
Where did you find Shimone and Pauline MILOSEVIC?
The Croatian spelling for these names could be Simun and Paulina.
If we can lets move ahead in time to US records.
What US records do you have for her? I would like to see them, so if can let me know what you have and where I can find them it may help