O Master, Lord our God, Who in Thy wisdom hast created man, and didst honor him with Thy Divine image, and place in him the spirit of life, and lead him into this world, bestowing on him the hope of resurrection and life everlasting; and after he had violated Thy commandments, Thou O Gracious lover of mankind, didst descend to the earth that Thou mightest renew again the creation of Thy hands. Therefore we pray Thee, O All-Holy Master give rest to the souls of Thy handmaiden, Mary, in a place of brightness, a place of green pasture, a place of repose, and, in that they have sinned in word, or deed or thought forgive them: For Thou art a good God and lovest mankind and unto Thee do we ascribe Glory, together with Thy Father, Who is from everlasting and Thine All-Holy and good, and ever giving Spirit, now, and ever, and unto ages of ages. Amen.
My condolences to you and your family on the loss of your Grandmother. May the Lord comfort and guide your family during this period of mourning.