I think it says something when it's almost jarring when a dwarven woman character doesn't fit the expected mold. Like Sigrun, for example. Her voice acting confused me so much, as it's a generic American accent with no hint of fantasy influence. Plus her mocking you whenever you failed to open a locked chest: "Faaail!"
I don't know if the VA didn't have a clear idea of how to portray her, or if Bioware was pulling one of those heavy-handed break-the-mold/tongue-in-cheek things, like the self-deprecating rat killing sequence at the start of DA:O.
All the dwarves in DA have American accents.