personally with a one single rose to wish her and tell her this was all your idea. she will definitely get impressed by it.
this is one of the unique thing you can do for her. gift her a bottle in which you can put a love note for her. you can decorate the bottle with some attractive ribbons. she will be curious to read that note.
on her birthday you must make her feel special. you must show how much you love and care about her. to make her feel special, i have an idea for you. why not a gown for the day that would make her look like a 