I would strongly recommend not doing it, but if you insist...
I don't know if it's just me, but "anata ga daisuki" sounds a bit girlish/childish. I think it would be better "name/anata/kimi no koto ga suki desu", or maybe even without the "no koto" part. And I wouldn't use that last sentence, it's kinda strange... Better to just wait for her reaction.