Sorry this is so long but don't want to drip feed and then have to answer questions.
My sister is 15 years older than me. Dad was a brute so sister married at 16 to get away from him. We did not grow up together but kept in contact via letters and occasional visits.
Our lives could not have been more different. She had kids in her teens and by her mid thirties was a free woman again with a divorce settlement that left her rich. She got into a top university as a mature student, dedicated her whole time to study, and graduated with First Class Honours. She then started a career as a uni lecturer.
I was raised in poverty and my dad was a violent alcoholic. Life was so chaotic that missed a lot of school. At age 16 I also left home, but I had no qualifications so my wages were so low that I could barely pay my rent and bills. In my 30s I joined the OU but working round-the-clock shifts was never able to attend lectures and also I was living with an abusive boyfriend who made my life insecure and caused me great anxiety. By some miracle after six years of hard graft I managed to graduate, but at the lowest grade of 2:2. I became deeply interested in history and ended up writing a biography of a famous woman. The book is published and available everywhere.
Somewhere along the line my sister and I fell out about some stupid thing that I cannot even remember and have not spoken for about 15 years. However, we live in the same county and her uni is the nearest one to me.
I have lately found out that when she socialises with her university colleagues she tells them that my book must be utter rubbish because I am not a "proper historian" and I don't have a "proper degree", and that I barely even went to school.
Learning this has been absolutely devastating to me. I mean, I know that we have fallen out but it's so hurtful to discover she is actively trying to denigrate my small achievement and smear me, to put her colleagues off reading my book.
I was wondering whether I should write her a letter or just leave it and do nothing.