What's the Name of That Book??? discussion

This topic is about
Coming of Age
SOLVED: Children's/YA
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SOLVED. Coming of Age book. Amy's mother dies at the start and she loses her voice and can't speak out of shock. she regains it later. Years later, her dad gets a new girlfriend [s]
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I was sure it was called 'The coming of Age', but i've looked it up several times and I can't find any book by that title, so perhaps I was wrong. Anyway, what I do remember is:
-The author is female.
-The main character was called Amy.
-Her mother dies at the start and she loses her voice and can't speak out of shock. she regains it later.
-Years later, her dad gets a new girlfriend.
-She finds a postcard in her mums old office that leads her to believe she was having an affair around the time she died.
-She goes to italy to find this man.
-She learns that her mothers death wasnt an accident, that her father had pushed her off her horse in rage once he realised she was having an affair.
I've basically given the whole plot,and I have asked around on the internet before and asked at my library for the title but to no avail.
I was hoping someone on this site might know what book i'm talking about?