if the Somalian girl identifies as Somalian, and both her parents do the same I suppose (she didn't say that one of her parents are from another country or are of a different race...not that I can remember), then it makes sense that SE Bantu popped up in such a large amount. She shouldn't be surprised if she knows how to interpret the results. I don't sense that she was. If anything she was surprised with the West Asia and North African results.
People within the SE Bantu region are admixed with Middle East, North Africa, etc. it's a gumbo of mess. Categories like GHana, Nigeria, etc. didn't return those mixes within the samples. Generally those areas returned mixes from neighboring west african countries.
So that shows you how much of a wild card SE Bantu is. Don't take its label literally.
The same with "Native American". It may say NA, but most of the samples that AncestryDNA and all other DNA companies have are from SOUTH American countries. Which is why I say these tests are most useful in conjunction with traditional genealogical research, if possible.
