From the 911 call Lena obviously gives consideration to the possibility that lil A wandered off...thus a possible reason she could have been driving the adjacent streets looking for her. She also gives consideration to the possibility that her own mother could have come and gotten lil A. Heck, perhaps Lena is a heavy sleeper and thought Mom may have come while she was sleeping, told her she was taking lil A, and Lena simply doesn't remember it....but upon waking Lena panicked before she called her Mom to ask. I'm NOT making excuses for her or against her.
I honestly DO NOT have an opinion in this case. I'm utterly and totally baffled. But one thing keeps slapping me in the face. On this 911 call Lena mentions the potential for wandering off AND the potential for someone taking lil A (even if that someone is 'just' Lena's Mom)....but during the whole checking the closets, under the bed, in the basement, driving the streets....not one single time (assuming that lil A DID wander off) does Lena think it's necessary to mention that the doors may have been unlocked and that they live 200-250 feet from a RIVER?????