My Heart Needs by Nicole S. Goodin

I try not to think too hard about the fact that in order for me to live, someone else had to die.
Everyone gets to live.
Some for longer than others.

For Violet, born with a life threatening heart defect that has controlled her twenty-one-years, life has been anything but easy.
When reality is a high-risk game of trial and error, Violet finds solace the only way she knows how – with a brush in her hand.
But everything can change in a heartbeat.
Surrounded by loving family and the best friend a girl could ask for, Violet must ask the universe for the biggest favour of all – the one that will keep her alive.