Picture a corner of her home. Does she keep the middle of the dining table free, or leave room for a large vase by the window?
For the breakfast table
Check the total height so two people can see each other over breakfast. A low hydrangea arrangement gives even a small space a full flower head.
For a console
Magnolia branches leave open spaces through which the wall is visible. Hydrangeas have a fuller silhouette. Choose the shape that fits the spot before deciding on colour.