Jane Danielle Dolby (50) appeared in the Royal Court before the Bailiff, Timothy Le Cocq, on Friday.
She admitted one count of larceny, relating to £23,380 taken from the Jersey Dressage Club between March 2018 and 21 September 2019.
A bail application was refused, and Dolby was remanded in custody until Friday 11 September, when she will be sentenced.
Advocate Lorraine McClure appeared on Dolby’s behalf.