What if? - Martina Reilly

When Lily Flynn's memory starts to fade, she dusts off the long-forgotten diary she'd kept when she was fifteen and slowly begins to fill in the details of her life.
Five years later, when Lily is admitted to Lakelands Nursing Home, a helper finds the diary and a letter addressed to Lily's daughter Deirdre with instructions that the diary be read aloud to her.
Lily's last wish is that Deirdre learn the truth about her birth so that she might be able to understand her mother's choices all those years ago.
And there begins a journey of three women - Lily, a young woman dreaming of the day she can escape to the city; her daughter Deirdre who has always felt responsible for the life her mother never had; and Zoe, the young helper who reads the diary to Deirdre.
As each woman steps back in time, they realise that while life might turn on a single moment, what happens afterward is up to them.