I did this with my ex-bf (not the cause of the prefix!) and then next time I told him I was really upset by something at work, I got flowers and felt much happier. And my delight was such that he was happy too.

I'd explain what about the gift from her makes you happy. I don't like tchotchkes or expensive-for-the-sake-of-signalling things, but I liked being surprised by some manifestation of my bf caring for me, especially when it was personal (i.e. in response to a sudden need, or carrying forward an inside joke, or just a lovely note in my inbox).