Hennessy, who turns 22 on 20 October, stopped Aurora de Persio in May for her second stoppage win in nine bouts.
She would surpass undisputed flyweight champion American Gabriela Fundora’s record of 22 years and 218 days.
Thorslund, 32, dethroned Cherneka Johnson in August to claim the WBC, WBO, WBA and IBF titles.
Just over a year earlier, Thorslund relinquished her WBC and WBO titles after becoming pregnant.
BBC Sport has contacted Thorslund’s promoters, Most Valuable Promotions, and her management for comment.
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