Does she drink tea? There are gorgeous flower glasses that are fancy, beautiful and gosh, simply stunning. They are about $25 or so, each. Paired with a selection of Bigelow teas (Constant Comment is my favorite) or Twinings tea (Breakfast is a black tea I like)

These are the ones I was referring to. https://www.amazon.com/Flower-Teacup-Transparent-Glass-Spoon/dp/B097RFHTX7/

Or, (and not available on Amazon) ... As she likes flowers, and if your climate is conducive for year round flowers what about you planting for her a Mama's Garden, complete with a sign designating same? This could provide years of additions, such as a bird bath, outdoor table and two chairs, more flowers, fruit trees, etc. Basically it could be a long term gift, providing you're close and she is likely to stay in her home.