Had purchased petunia (Peace lily) around a month ago was doing amazing until 2 days ago where I noticed the petal turning brown and had only got worst from there. I did water the plant using a food for peace lilys and I’ve been spraying the leaves as to not lose humidity (not huge amounts of sprays, like a 10ml bottle used). Could someone please help me figure out what’s wrong. I really do t want to have damaged her.