Hise and go seek

In the article, Baby missing for 5 days found alive under bed by Associated Press explains a mysterious case where a baby was found under a bed, alive, in a box. After a five day search, investigators found a seven month old girl named Shannon Dedrick, under Shannon’s Aunt’s bed. Chrystina Lynn Mercer (her mom) gave the girl to her baby sister (Susan Elizabeth Baker) early Saturday before she was reported missing.
I thought this was very weird and confusing. In the first place why would you even give your child away, that you are supposed to love and care for, to someone else. But whose fault was it? The mom wrote a letter to the governor of Florida saying she needed help with her daughter because Shannon’s father shook the baby girl and that Christina Mercer and other people smoked and did bad drugs around her. You know what they say, “never shake a baby.” Reporters say that the father of the baby wasn’t involved in the crime.
When investigators found the baby under the bed it was in perfect condition and it had been fed recently. Although they say the baby girl had been fed, there was no bottle in the box with her. The parents said they saw Shannon about five hours after she had gone missing.
“Statistically Shannon should not have still been alive,” said police officer Bobby Haddock. This event that all happened because someone obviously wanted attention. So they did something very wrong that caused a lot of havoc. More then 100 law enforcement agents and others spent hot days looking in vines and deep bushed looking for the child.
I go back to the question whose fault was it? Was it the aunt’s fault or the moms fault? I am lost. Did the mom give the baby to her sister on purpose or did she just need to take a break. Was the sister forced to hide the child by the mom or else, or did the sister plan to do it and forcibly took the child away. The sister was involved in a case exactly like this more then two decades ago. She told reporters her stepson, 3-year-old Paul Leonard Baker, disappeared from the family's Beaufort, S.C., home on March 5, 1987, while she was napping.
Both the mom and the sister are in jail. . Mercer is charged with interference of child custody, desertion of a child and several other charges. Charges against Baker include neglect of a child with aggravated circumstances and interference of child custody.
I don’t know whose fault it is but why would you even think about doing this.