The 14 year old from the Barra in the Outer Hebrides attended the Ariana Grande concert on Monday with her 15 year old friend, Laura MacIntyre.
Roddy and Marion MacLeod said: "Eilidh and Laura were so excited about going to the concert together but what should have been the perfect ending to a fantastic trip ended so tragically.
"We continue to have Laura and her family in our thoughts and pray that she makes a full recovery."
The friends both attended Castlebay Community School on the island. Laura has been receiving care at a hospital in Manchester.
Speaking at Mass on Sunday, Barra parish priest Fr John Paul MacKinnon the week turned into a "living nightmare" for the island.
He went on to say: "I have spoken to both families, to both sets of parents and they have asked me to tell everyone that they are so grateful for all your love and support, prayers and messages.
"Their hearts are broken, their lives have changed forever but they are lifted up by the love and support of their island and also by the wider world."
Fr MacKinnon also encouraged congregation members to "come together" in the wake of Monday's attack and pray that the Holy Spirit would come down "especially upon the MacLeod Family and MacIntyre Family."
Speaking about Eilidh MacLeod, he will say; "She will forever be loved and remembered by her family and by all her many friends. Our loss is certainly heaven's gain."