answer:The best course of action when you don’t know what to do in a particular situation is to observe and copy what other people around you do. You can bring the flower with you and see if other people also deliver the flower at that time but my feeling tells me that it would be more comfortable for both her and you if it’s done backstage. Gosh, honestly I don’t believe women this age are still in to flowers but if that what the culture demands then go for it. Assuming you give her real and cut flower, I don’t think the flowers need to be in vase to be presentable (it’s not like many people plan to grow the flowers). Personally, I find plastic flowers to be horrid and lacking taste. If you want to give her other things, the best one is of course, the things that she like the most, something that you need to find out about her (so long as it’s affordable and you think she deserves it). Besides flowers, I would like to suggest a pack of quality tea leaves or coffee would be nice. A bottle of **** or champagne too would surely make her happy. This is just like the Chinese culture in my place. We give people money in red envelopes for karaoke performers in a show, and it’s done while they’re singing and in front of other people but your culture might be different so you’ll have more freedom to act as convenient as you want.