She had been reported missing on Friday afternoon.
Police, firefighters, coastguard crews and mountain rescue teams took part in the three-day search.
The death is not being treated as suspicious.
A report will be submitted to the Procurator Fiscal.
Body found in Benbecula formally identified as Shanahan MacInnes
A Facebook post shared by police reads: “The body of a woman found in the Aird area of Benbecula on Sunday, 24 November, 2024, has been formally identified as 28-year-old Shanahan MacInnes.
“The death is not being treated as suspicious and a report will be submitted to the Procurator Fiscal.”
Body of woman found in Western Isles formally identified as missing woman Shanahan MacInnes