Given the fact that she sounds delusional and is actively hallucinating, you can call the Child protective service of your locality and report that this young child is in the care of some mone who is actively psychotic. Expect a great deal of resistance from the authorities a they tend not to want to not get involved, Do not accept the line worker';s decision. Keep on going up the supervisory chain and docum,ent all with a letter which indicates that if any harm occurs to this child you will hold the people that you have contacted and notified responsible for allpwing the child to stay in this dangerious environment.
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A complaint to the police that she is bizarre and has threatened to kill all the family members should suffice to get her picked up and evaluated. I am sorry but I don't know the specific regs in Mississippi. You can can go to the equivalent of adult protective services and raise a complaint. It would carry more weight if the people who were witness to her threatening to kill all the family members were petitioners. The husband could clearly be accused of bias and serving his own ends. Just be forewarned that this is not a easy job-but you may be saving a life. If she is as psychotic as you state she may not show at the courthouse and if you have the resources and she does not show you may require the services of a private investigator.