Death & other happy endings - Melanie Cantor

Jennifer Cole has just been told that she has a terminal blood disease. She has three months to live -- ninety days to say goodbye to friends and family and put her affairs in order. Trying to focus on the positives (at least she'll never lose her teeth) Jennifer realises she has one overriding regret: the words she's left unsaid.
Rather than pursuing a frantic bucket list, she chooses to stay put, and write letters to three significant people in her life: her overbearing, selfish sister, her jelly-spined, cheating ex-husband, and her charming, unreliable ex-boyfriend finally telling them the things she's always wanted to say but never dared.
At first, Jennifer feels cleansed by her catharsis. Liberated, even. But once you start telling the truth, it's hard to stop. And, as she soon discovers, the truth isn't always as straightforward as it seems, and death has a way of surprising you ..