There are no restrictions on obtaining uncertified copies of NY death records more than 50 years old, which are considered public records. In New York, vital records are issued by the municipalities, which send copies to the state Dept. of Health. The NY death index shows that Amelia Robertson died 1 Feb 1924 in Mineola, which is in Nassau County (not Suffolk); the state file number is 11179. You may be able to obtain a genealogy copy directly from the village, or they may require you to order from the state.
If you want info about Parmelia’s parents, her death record will probably be more helpful than Amelia’s.
Here is a link to a free copy of the state index: https://archive.org/search.php?query=%22New+York+State+Death...