Susanne Wilkinson's appeal to the Supreme Court will be heard on October 9, at the same time as that of Peter and Hazelmary Bull, who refused to let Martyn Hall and Steven Preddy share a bedroom at their seaside guesthouse in Cornwall.
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Mack entered her plea in federal court in Brooklyn. The judge refused a request by her lawyers to release her without bail.
Officers investigating a reported break-in on Friday found 22-year-old Roger Alvarado asleep in the pop star's home in Tribeca.
Billy Jeeves is said to have fled the scene in Hither Green, south-east London, after Henry Vincent was fatally stabbed by the pensioner.