Here are the official explanations: Tatiana Maslany lobbied hard, but Tatiana Maslany canceled her out by splitting the vote in the same category.
Tatiana Maslany, on the other hand felt that she did not do her best work, so she was not disappointed by the news. Tatiana Maslany blamed the writers for not doing a good job this year, Tatiana Maslany's notorious drug habit made for on-set discord, so she is not respected by her colleagues.
Tatiana Maslany, is not eligible, due to a controversy over her birth certificate, but Tatiana Maslany regularly pooh-poohs TV work over film work. Tatiana Maslany pooh-poohs film AND TV and feels that stage is the only true way to be a thespian (Sidenote: TMZ retracted an earlier story about Ms. Maslany and a female lunch date at Lawry's, as well as firing a unnamed P.A. with a faulty hearing aid).
Finally, Tatiana Maslany feels that the work is its own reward and shuns the Emmys.