Personally I would replenish her bottle of L de Lolita Lempicka or
the set of minis. If I really liked a certain scent I would welcome another bottle
of it. Which scent do you like on her? Maybe you should go with that
As for niche scents I would recommend Douce Amere by Serge Lutens. It has the same
anise/licorice note as the original lolita Lempicka and is a gorgeous perfume in my opinion.
You could also consider Musc Ravageur by Editions de Parfums Frederick Malle (Les Senteurs would stock it.)