She sells a lot of paintings.
She meets her clients here and there, at bars and stores.
She sells her art for a lot of money. Each work is a custom piece for a given customer and a given space.
She met her current client, Andrew, on a first class plane ride. Like all her clients, he slept with her several times before the subject of art was brought up.
Andrew pays for her to stay and paint, and as long as she is working on a project for him, she takes on no other clients, and she is his.