I have a higher level Warpriest priest of Shelyn, and just based on what context we have he would likely destroy it. I operate him based on the Paladin code, and that does state you can destroy/sacrifice art to save a life. He would believe that (Depending on the God/Goddess) leaving the statue as is could cost people's lives or souls later, so better to destroy it and if Shelyn is displeased ask forgiveness later.
If it's Lamashtu or another divine that destroys beauty I doubt Shelyn will mind at all, since discourage future worship will protect the beauty in the world.
Ultimately it's your GMs interpretation of Shelyn's will that matters, and whatever he thinks she'd approve of would be the best course for your character.
