If it's up against a building, especially brick or stone, and hot and dry (because stone will absorb heat in the morning, and then radiate it, so it's warmer than shade from trees) then coneflowers, blanket flowers, asters, and threadleaf coreopsis would probably do fine, as well as phlox, columbine, and monarda (going to slightly less drought tolerant on these last 3). The coreopsis might not flower as heavily depending on amount of sun, but will stick around and flower some in those conditions. Too much humidity combined with too much shade might result in powdery mildew on the monarda, but depends on her conditions, and it's a nice flower if she likes it.
If the conditions are more moist, astilbe and japanese anemone are among flowers that would thrive. This type of anemone is what flowers in the fall, and has nice greenery to fill in (such as 'honorine jobert', which I've grown in partial shade in zone 6).
The above are all easy to grow and easy to find in nurseries and garden centers.
Morning sun is about the best sun when it comes to only partial, so if she really likes a flower, I'd say give it a try and see how it does. Many flowers will do just fine with morning sun (given the right soil and moisture requirements).
