Cops don't think she ran away, nothing was missing from her room, but in a more sinister twist they believe she was kidnapped from the small town of McCleary, WA.
An FBI Child Abduction Rapid Deployment Team also yielded no results, despite checking all the available CCTV footage in the town and repeatedly interviewing the residents.
Despite the length of time her mom Melissa is refusing to give up hope on her little girl, vowing to fight on until her little girls returned.
She told KOMO recently on the two-year anniversary of her disappearance: "I still believe she's out there - not giving up till we find her."
"I look forward to her coming home.""Two years ago, I was a single mom, working mom, raising two kids and that's not the case anymore. The only thing that hasn't changed is my determination to find Lindsey and the love that I have for her."
She added that it was not just her daughter who's missing, but her best friend.
Melissa has also set up this website for tips.
A donor recently added another $5,000 to the reward for finding Lindsey - making it $35,000 for anyone who knows where she is.
Anyone with any information is urged to contact Grays Harbor County Information Hot-line (Tip line) (866) 915-8299, Email: email@example.com