Sarah Haines, 31, of Mount Olive left her daughter on June 3 last year with plenty of food, beverages and $US10 in cash for what was supposed to be a three-day trip, the Morris County Daily Record reported.
Haines said she had made arrangements for a friend to look after her daughter but the girl ended up staying alone most of the time.
Police, acting on a tip, stopped at the home on June 9 to conduct a welfare check on the girl who told officers her mother had travelled to Washington State to get married and was delayed because her flight home was cancelled.
It was later determined that Haines was actually in Idaho.
The Morris County assistant prosecutor recommended that the mother be given a three-year probation at her sentencing next month.