She has the phone
Which leaves exactly one thing to buy her, and one decision to make about it.
A case is a good gift for a specific reason: it is the one accessory she will look at forty times a day and will not buy twice. The risk is picking a print she would not have picked.
So choose by occasion rather than by pattern. Someone who carries the phone into meetings wants something different from someone who carries it to dinner, and that is a much easier thing to know about a person than which florals they like.
Everyday
Goes with whatever you already own.
Work
Quiet enough to put on a meeting table.
3 for 2Best seller
Fleurette
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3 for 2Best seller
Tortoiseshell
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3 for 2Most wanted
Houndstooth
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3 for 2Most wanted
Zebra Crossing
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Evening
The one that earns a second look.
Weekend
Louder, warmer, less careful.