Hi Butterscotching, welcome to basenotes! The first scent that comes to my mind as being a "delicate, fresh & gently sparkling" floral with a touch of vanilla is Chanel Allure. l would also recommend Un Matin d'Orage by Annick Goutal, Ophelia by Heeley or perhaps even Carnal Flower by Frederick Malle. These all evoke rain-soaked, fresh flowers to me. l don't know much about heliotrope, but l believe Apres l'Ondee by Guerlain contains this note? On me it's a very fleeting but quite beautiful, delicate floral.
Do report back if you try any of these or other's suggestions! We are all here to learn & share & we won't laugh at you for loving what you love.