Misty, who married Cummings following Haleigh's disappearance, was babysitting Haleigh the night she disappeared.
But on "The Early Show" Misty blamed "the other side of the family" for the girl's disappearance.
"Someone came in and got her, obviously," Misty told "Early Show" co-anchor Maggie Rodriguez, "I feel like it's on the other side of the family that has her."
Rodriguez pointed out Haleigh's father, Ronald Cummings, said he wants to divorce 17-year-old Misty because of inconsistencies in her story.
In February, Misty claims, she put Haleigh to bed at 8 p.m., but when she woke up around 3:30 a.m. to get some water, the back door was wide open -- and 5-year-old Haleigh was gone.
Misty told Rodriguez the divorce is about the pressure the couple is facing, not her story of what happened the night Haleigh disappeared.
"He tells me, it's just too much pressure on us right now. And you know, I got family problems. My family's trying to start problems. It's just too hard," she said.
"He believes me. He doesn't think I had anything to do with Haleigh going missing."
In response to people and Florida police, who believe Misty is a suspect in Haleigh's disappearance, Misty said, "They just need to move on and look for the right person because they're focusing on me, and I'm not the one who has Haleigh. I don't know where she is so they need to look for the person that does have Haleigh."
Misty took a polygraph test and failed. She told Rodriguez someone told her she may have failed because she feels like Haleigh's disappearance is her fault because she was the last person seen with Haleigh.
Ronald was working the overnight shift as a crane operator on the night of February 9. When he returned home his daughter was gone.
Ronald said in February, "Somebody has her, they have her hid. I just want my daughter back, that's it."
Misty was also babysitting Haleigh's brother Ronald.
Misty said on "The Early Show" she loved Haleigh and Ronald. She said these months without Haleigh have been "hard."
"I just want everything to be back to normal. I want Haleigh home," Misty said.
Misty said she still believes Haleigh is alive.
Misty and Ronald married a month after Haleigh's disappearance, but they've recently separated. Misty said she believes Ronald will go through with the divorce.
"If that's what happens, it happens. You know, we're going to still stay in contact," Misty said. "And if something happens down the road, then we might end up back together. I don't know."
Misty said she doesn't fear she's going to be arrested.
"I'm always being told all kinds of different things, so I just don't even pay attention to them," she said.
Florida police launched an extensive search for Haleigh after her disappearance. Officials say they've received more than four thousand tips, but appear no closer to knowing what happened to Haleigh than they were the morning she disappeared.