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Reason #1: Loyalty
Well, she's loyal to Miss Blair at least, and that's what counts since Blair hasn't been able to count on anybody else in her life.
Examples: Dorota helped steal back Blair's phone after it was confiscated at school. And, despite her boss' eccentricities, Dorota follows her instructions as well as she can, such as when Serena and Chuck come by and demand to know where Blair is.
"I'm sorry but Miss Blair very specific: No tell Miss Serena, no tell Mr. Chuck," Dorota declares, "but if Mr. Chuck come, tell him Mr. Carter is more attentive to woman's [needs]."