The prosecutor says Tran also threatened to kill her 10-year-old son, who fled the house and called a relative, who called police.
The 47-year-old Elmwood Park resident is being held at the Bergen Regional Medical Center on $2 million bail.
Tran was initially arrested Sunday and charged with murder in the death of her husband.
Minh Trung Tran had suffered a stroke several months ago.
Neighbors said Jenny Tran was struggling to find affordable health care.
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