I don't think she was sexually molested but this woman has serious issues.
To beat the child and burn her shave her head.....
Sick, at least she left the child alive and it seems she wanted her found otherwise she would not leave her on the side of a road.
It's not clear that she wanted her found alive. She tortured the child and left her half buried in leaves and dirt when LE began calling her repeatedly on her cell phone. She knew they suspected her of kidnapping Lyndon and that they were very close by, looking for her car. She got out of her car, stripped the clothing off Lyndon, and buried her in dirt and leaves just about 3 miles from her parent's home, as LE was calling her cell phone again and again. As soon as she headed for her parents' home, LE arrived.
Hanna tortured and injured Lyndon extensively in the short period of time after kidnapping her. IMO, it's very likely she would have inflicted more torture and injury on her, possibly killed her, if she hadn't been caught so quickly.
It also seems very unlikely she wanted Lyndon found, as she was partially buried on the side of the road. Hanna had dirt under her fingernails from digging a hole in the ground.