"People I’m around know my car, and know me, I don’t think they will do something like that," said Martinez.
Martinez told Boston 25 News she felt as though she had lost a part of herself.
She then decided to take matters into her own hands and launch her own investigation after she felt police weren't doing enough.
"For them, it's a dog - for me, it's a child," said Martinez.
Martinez posted the suspect's photo all over Facebook, until she was tipped off by a friend to an address in Methuen.
"I drove there, and called police after when I was in the house," said Martinez.
She said the suspect's mother gave her Nikko back.
"I'm proud of myself for going there," said Martinez.
The suspect is still at large and has outstanding warrants.