Lani, who attended Pukenui and Ngataki schools, then Kaitaia College, fell ill when she was 18. She was not expected to live beyond the age of 25, but fought bravely, until early 2012. She was 34.
Anyone who found the photos would not be able to mistake them, Mrs McKellar said.
"She had such beautiful red hair. One of the photos was taken of her drinking through a straw when she was 14. Another was taken at her 21st, and there are three of her when she was 25."
Anyone who finds the photos is asked to return them via the Northland Age.
Meanwhile, Mrs McKellar said she had learned from her bitter experience.
"I won't open the door to anyone any more," she said.
"I leave a gap for the cat but everything else is locked.
"And you know, this boy inly had to ask and I would have given him anything he wanted and that I was able to give him. I just don't know why he did this."