Kia orana Nadine:http://www.cdc.gov/nchs/w2w/american_samoa.htm
Where to Write for Vital Records - American Samoahttps://wiki.familysearch.org/en/Samoa_Vital_Records
Samoa Vital Records
If Maria doesn't show up, it may be under Malia.
I have only been back a week after a 3-year absence from genealogy, so I don't have the address/number in New Zealand for you. If you are unable to Google and retrieve it, get back to me and I will try to have the info for you.