Keating, 20, stood in the dock at Manchester magistrates court alongside her mother, Nicola Keating, 48, jointly charged with possession of the Class C drug, more widely known as laughing gas, in Manchester last month.
The footballer, wearing a black trouser suit and trainers, spoke only to confirm her name and address.
She was asked to indicate a plea and replied "not guilty", as did her mother.
The charge is an "either way" offence and can be heard by magistrates or at a crown court before a jury. Both women chose to have their case heard before magistrates.
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