What is my one year old cat Sansa?

Im really curious what her breed is, shes a domestic short hair and thats all i know.

Here is a better picture of her back

She is domestic short hair, precisely as you say. So its her "breed".  That particular pattern of colored parts and white may be called for Saddle.

She seems to be a tabby too - I dont see if she is a broken mackerel, or perhaps even a spotted tabby...  You perhaps see it better being there.

The color isnt that most usual.

DSH, black and brown mackerel tabby and white in the pattern of Saddle. 

  Perhaps.  Im not entirely sure, there are probably several ways to say roughly the same.