She points out in the dream to how one handles with his personal abilities. The workshop is the site of the creativity, – from her points the dreaming of the world what he has dealt with. There he uses and checks his propelling reserves and motivation reserves and all his abilities. A repair workshop for cars can refer, e.g., to the need for personal attention and maybe after physical allowance.
The dreaming owns spiritual tools which he can pull up at certain moments for his support. A garage reminds the dreaming of the fact that he has this special aid on camp and can use them any time.