three-month old baby alice died of unknown causes and was found with roach bites on her legs and head .
brittany bell , 27 , found the lifeless infant and was worried one of her twins might be responsible after she fell asleep while watching a movie with them .
as no cause of death was determined authorities could not pursue a homicide charge .
bell has a history of leaving her young children unattended , prompting neighbors to call the police on a previous occasion .
the twins have been taken into care and bell faces a may 8 hearing .