The 78-year-old woman hit a jackpot playing a nickel slot machine at Harrah's Resort Atlantic City in May of last year.
Her lawyer says all the lights and bells went off and the meter indicated she had won the top prize of $86,000.
But Harrah's claimed the jackpot was actually just over 20-grand.
Domino refused to accept the lower payment.
Now, Domino is suing the casino, the slot machine maker and others in New Jersey Superior Court.