In genealogy, researchers try to learn from tombstones. This woman probably came to the U.S. as a political refugee in the 1970's or 80's, following the Vietnam War, when she was at least 60 years old. She was a Christian, possibly a Catholic (we have a lot of Vietnamese priests in Louisiana.) I can't imagine what she went through or the losses she suffered.
If anyone knows Vietnamese, maybe they could help me with the translation, as it is difficult with Google translate. I found that "Buôn" is not usually a name; it may mean sad. Like Dolores? The final line may mean "dear son," who mourns his mother, or it may refer to her ancestors.