Police are trying to sort out the facts surrounding the disappearance of a 9-year-old Indiana girl two days before Christmas.

Amber Story, the grandmother of Aliahna Lemmon, told HLN’s Nancy Grace in an interview airing Monday night that she believes the girl could have sleepwalked out of a neighbor’s Fort Wayne home early Friday morning and been taken.

According to Story, 9-year-old Aliahna and her two sisters were staying with a neighbor, Michael Plumadore, while her mother recovered from the flu. Aliahna suffered from night terrors and Plumadore was up for much of the night comforting her, Story said. Around 6 am, after she fell asleep, he left his mobile home to go buy a cigar.

When Plumadore returned, he believed all of the girls were still sleeping. He went to sleep and woke up around 10, at which point the 6-year-old sisters told him Aliahna’s mother, Tarah Souders, had picked her up. Story said that miscommunication between Plumadore and Souders led to a 10-hour gap before anyone realized Aliahna was missing and they called police around 8:30 pm.

Story said Plumadore is a close family friend who cared for Aliahna’s grandfather for two years before his death earlier this month. He has a few felony convictions in his past, but none appear to involve crimes against children.

“I have no qualms in saying Mike would not hurt any of those children,” Story said “…The only blame is to the person who took her.”

Still, she acknowledged that it was probably a mistake for Plumadore to leave the children alone. Story said Aliahna’s mother’s trailer has a deadbolt that is high enough that the girl cannot reach it but Plumadore’s does not, and Aliahna is capable of unlocking and opening a door in her sleep. The girl suffers from partial hearing loss and partial blindness, according to Story, but she has gotten out of her home while sleepwalking before.

Story said police have questioned Aliahna’s whole family—including the young girls—in addition to Plumadore and other neighbors. According to the Journal Gazette, there are 15 sex offenders in the mobile home park where her mother and Plumadore live, and police have spoken to all of them.

Story told Grace that search dogs picked up Aliahna’s scent going from Plumadore’s home to a bus stop but her trail then vanished. The bus stop is on the side of a busy road and Story speculated that someone may have abducted her from there.

Police told reporters Monday that they have no new leads or suspects in Aliahna’s disappearance, but they are working on the case around the clock, according to WPTA.

Watch “Nancy Grace” Monday at 8 pm ET on HLN for the full interview with Amber Story and the latest on the search for Aliahna.

Waterville police announced a $30,000 reward Monday for information leading to the location of missing 20-month-old Ayla Reynolds, and they revealed that they are now “very confident” that Ayla was taken from her father’s home.

The reward is being offered by a local attorney on behalf of several individuals and businesses in the community. Police Chief Joseph Massey said at an afternoon press conference that it was the largest reward in a missing person case that he could recall in Maine history.

Ayla Reynolds was reportedly last seen in her father’s home on the night of December 16, and Massey said that at this point in the investigation, police “are confident that Ayla did not walk out of the house by herself.”

Figuring out who she left with and under what circumstances is now the focus of the investigation, according to Massey. He would not speculate on whether she was taken away by someone within the house or by an intruder.

Maine State Police had said Saturday that investigators planned to continue searching for Ayla over the holiday weekend “outside the microscope” of national media attention.

Crime scene tape was put up on Thursday around the Waterville home of Ayla’s father, where she was reportedly last seen on December 16, and prosecutors from the state attorney general’s office criminal division were seen visiting the house. That afternoon, police downplayed the significance of the activity at the home, insisting that it was routine, according to the Morning Sentinel.

WMUR reported that Waterville Police Chief Joseph Massey said authorities did not need a search warrant to seal off and search the property because they had the family’s permission. Massey also said that family members were being cooperative but none had taken a lie detector test.

Search efforts on Friday were hampered by snowfall, and police issued a statement Saturday saying that they needed room to investigate the case without the media spotlight on them.

Ayla’s father, Justin DiPietro, reported her missing on December 17, telling police that he had put her to bed the night before and she was gone when he woke up that morning.

Trista Reynolds, Ayla’s mother, told NBC’s “Today Show” Friday that she blamed DiPietro for whatever happened to their daughter, saying, “I trusted him to keep her safe…He did not protect her the way he was supposed to.”

Reynolds filed documents in court seeking full custody of Ayla the day before she was last seen, but she did not believe DiPietro was aware of that. DiPietro had taken over caring for Ayla when Reynolds entered a rehab program in October, but the girl broke her arm in his custody a few weeks before her disappearance. He claimed the injury occurred when he fell while carrying her.

DiPietro issued a statement last week denying that he had any knowledge of where Ayla was or who was responsible for her disappearance.