To find out more about her and how her spiritual experiences related to WW1, visit http://www.motherofallpeoples.com/2005/07/the-sorrowful-and-immaculate-heart-of-mary-the-revelations-of-berthe-petit/
Through Berthe Petit it was made known that Jesus wanted His mother to be honoured under the title Sorrowful and Immaculate Heart of Mary, and in due course the following short but powerful prayer was indulgenced by the Church:
Sorrowful and Immaculate Heart of Mary, pray for us who have recourse to you.
What is particularly interesting is the promise attached to it, 'This devotion to the Sorrowful and Immaculate Heart of My Mother will restore faith and hope to broken hearts and ruined families; it will help to repair the destruction; it will sweeten the sorrow.'
I know plenty of families where members are estranged from each other, and what heartache such estrangement causes. Then there are the families suffering the long term effects of separation and divorce, and the long term effects of abortion. I am sure that you know plenty of families in these situations, too. So let us take hold of this heavenly remedy which has been given to us, and use this little prayer whenever you are reminded of your own family's sorrow or are told of the sorrows of another family.
If you'd like to take hold of this further, the PDF below has some prayers and an act of consecration to the Sorrowful and Immaculate Heart of Mary composed by Berthe Petit.
Sorrowful and Immaculate Heart of Mary, we entrust ourselves, our families and our parishes to your intercession.