I was at the Jersey Archive this morning when I saw your message so had a quick look. This is what it says on the marriage entry.
14/4/1888 at St Saviour's Church
John Thomas Jeune, 43, Widower, occupation Labourer, Living in St Helier, born in Grouville. Father Philippe Jeune, Blacksmith
to
Victoire Francoise, 44, Widow of Alphonse Le Conte, Living in St Helier, born in Baynes, department de
Caen. Father Pierre Francoise, Carpenter
The witnesses were Aimable Le Conte and T.P. Laurens
So her maiden name was Francoise, it was not unusual in Jersey at that time for widowed ladies to be known by their maiden names.