With her own hand she'd painted herself into a corner, and then out of the picture altogether.
The quote reflects a sense of regret and self-erasure, indicating a character's acknowledgment of her own flawed decisions. By metaphorically painting herself into a corner, she finds herself trapped by choices that limit her options and lead to isolation. This imagery suggests a struggle with identity and the consequences of one's actions.
Ultimately, the act of painting herself out of the picture signifies a deliberate withdrawal from her surroundings and relationships. It underscores themes of alienation and the desire for self-preservation, as the character grapples with the complexities of her existence and the impact of her choices on her life and those around her.