totally agree with Rosie, fragrances smell different on different people, so maybe a good idea to see if you can get some sample perfumes, the ones on cards so she could try out a few. A really good place to visit is Les Senteurs, the closest one is in Elizabeth Street, Victoria. They will definitely be able to give you some little glass samplers to take away with you. There are some very nice rose perfumes in the Rosine range. I think the Stella one is a rose based fragrance, so she might like some of the Rosine fragrances. The Happy one is also very light, so it sounds like she doesn't like anything heavy. Elizabeth Street has lots of other nice shops in it, including the French Poilane bread shop, and clothes shops so it's good for a wander anyway.