Sabrina's tent, while quite smart-looking on the outside, is a palace on the inside — quite literally. The sorceress explains that the whole interior is achieved through the use of a sophisticated and powerful illusion, right down to the companion she keeps. The tent is the central feature of the camp near Kaer Morhen which she and Merwin have set up to track Deidre.
Sabrina can be found here throughout the game, she does not stray from her posh accommodation. She also indulges in a bit of commerce, ostensibly to pass the time. Geralt can purchase a few items from the sorceress if he visits her there.