Orlaigh Amos completed the walk from Fort William to Inverness in seven days, joined by her nana Bernadette Bell, who is 56, from Galashiels.
The pair wild-camped between days of long walks, carrying all their gear, with an elevation gain of more than 6,000ft, finishing their task last Sunday.
Orlaigh’s mum Nicole Holt said: “She found it tough going, but thankfully the weather was better than we had in the Borders, just a bit of drizzle. It was very windy, though, especially in the higher parts of the way.
“But she was determined to do something to raise awareness of stillbirth in memory of her wee brother.
“It was all her idea and I’m so proud ... she is some lass.”
Orlaigh, a P6 pupil at Knowepark Primary, wrote on her Just Giving page, where she had originally hoped to raise £50: “I am hoping to raise money and awareness for SIMBA in honour of my brother Louie, who was tragically stillborn. But he is and always will be my brother.
“SIMBA provided our family with a beautiful memorial box which holds treasured items for our family.
“They also helped provide books to explain to me and my brother Oliver what happened to our brother in ways in which we would understand.”
Her £50 target has since been blown out of the water, raising to date £2,364 for the charity, which supports families through baby loss.
It was helped along by a donation from nana Bernadette, who said: “Orlaigh what can I say, you are truly amazing.
“Doing the walk in honour of Louie and being able to help other families. Memories that will last a lifetime.”
The family enjoyed a day at the beach on their return ... a family tradition which they always do on the anniversary of Louie’s death.