>>720191718
You're putting words in her mouth. She never says she's escaping into the painting to escape life as a cripple. If she was in any pain, that was months ago. She's shown as healthy with some scars.
She escaped into the painting due to her guilt over her actions leading to Verso's death. She can't stand letting the last remaining part of him go. So she turns the painting into a dystopian prison.
>lose herself
She's a painter. It's her job to lose herself in paintings. If she really wanted superpowers, she would work on her painting skills. That's exactly what she doesn't do in her ending.