Hold Me Like a Breath by Tiffany Schmidt

Penelope Landlow is the second child of one of the major families that controls black market organ transplants. She has been surrounded by a protective bubble of medicine her entire life, especially since she is the victim of a rare autoimmune disease that causes her to bruise easily, but she is unexpectedly cast outside into the real world when tragedy strikes. Penny must learn how to truly live if she wants to prove to everyone that she is not as fragile as they think.