@Vivadiva - your thoughtful post sums up how I feel about Susan. None of this is her fault, she entered a competition knowing that people where she lives enjoyed her singing, that's all. Yes, she seems awkward and sometimes silly, but as you say, she has no social skills. When it was announced that she was through to the semi-final, she took several seconds before it sank in, compare that with Leona Lewis' OTT reaction when told she was the winner.
I think she's lovely, and I hope she doesn't change.