Description of problem is highly suggestive of Psychosis
and is not clear what to be leveled as information is not enough. She requires anti-psychotic medication
immediately as she is a safely concerns for herself and child as well as others. Consult a qualified psychiatrist
and take treatment immediately as now day so many treatment options are available and she can lead a normal life like you and me. Please be careful as she is predispose to harm self or other and don't leave her alone.
Hope she will recover soon.