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Basically, in a nutshell she is saying….groups of people in tight knit communities (in her case those people in Ballymacarrell (a Protestant area in East Belfast), the Hammer (a Protestant area in West Belfast) and the Clonard (a Catholic area in West Belfast) use more vernacular/non-standard forms. So in terms of regional variation this could be to do with identity as well as geography.
Her findings can also be linked to:
CLASS – her ‘areas’ were all predominantly working class with high levels of unemployment
GENDER – Women were less likely to use the non standard forms as not part of such tight knit social groups as men
SOCIAL GROUPS – If you are close to people you use similar language!
Hope this helps!
This page will help you massively!