She was shopping in the electrics section of the GO 2 store when her black and white bag was taken.
The incident happened on Monday at the newly-opened shop at Northside.
Guernsey Police would like to speak to anyone who saw what happened or who saw anyone in the vicinity carrying a black and white handbag that day.
Please contact PC 17 Kusimo if you have any information on 725111.
Pictured top: The bag was stolen from the GO 2 store.