Okay, here is a version of a Memorare prayer adapted to Our Lady of La Salette. While there isn't one *official* Memorare of Our Lady of La Salette, this is a prayer that combines the spirit of the Memorare with the message of La Salette:
Memorare to Our Lady of La Salette
Remember, O most gracious Virgin of La Salette, true Mother of Sorrows, it is unheard of that anyone who fled to your protection, implored your help, or sought your intercession was left unaided.
Inspired by this confidence, I fly unto you, O Virgin Reconciler, Mother of all Humanity. Despise not my petitions, O Mother of Mercy, but in your clemency hear and answer me. Remember the tears you shed on the Holy Mountain, for your children who forget your Son, who blaspheme His Holy Name, who profane the Lord's Day.
Obtain for me a spirit of repentance, a love for the Holy Eucharist, and a renewed zeal for prayer. Help me to live a life pleasing to God, to make reparation for my sins and the sins of the world, and to spread the message of reconciliation and conversion that you entrusted to Melanie and Maximin.
O Reconciler of Sinners, pray for us who have recourse to thee. Amen.