Erin has weak feelings of ethnic identity with her Scottish heritage and a strong sense of acculturation with the United States, proclaiming that she is an American and that is that! Erin would be considered:
Separatist
Assimilated
Bicultural
Marginal
If her country is currently the United States, then she is Assimilated. She is adamant about what she is. That means her heritage does not matter very much to her.