The 78-year-old, who lives in the Common End area of the town, has refused to be identified for fear of repercussions.
She has lived in her home for 11 years and, for a long time, has had her garden ornaments regularly stolen.
The last time was on Saturday night. At around 9.30pm, she looked out to admire her handiwork as she had spent the day washing and repainting various garden items.
The following morning, feeders from a wrought iron bird table and a garden gnome had been stolen.
She said: "Last year, I bought two chrome planters and they looked lovely, but they didn't last long. Nothing does.
"What kind of freak begrudges a 78-year-old the pleasure of having a bit of garden to tend to?
"As soon as I attempt to smarten things up a bit, it is noticed and the sticky fingers get to work."
Neighbourhood police team sergeant Victor Thimm said: "These thefts are cruel and distressing, and we ask anyone with information to contact us on either 01977 601097 or 651097.
"We will increase patrols in this area in an effort to prevent this kind of thing happening."