We recieved a peace lilly from family members after our 17 month old grandson was murdered. Its my first plant so i am by no means a green thumb like my grandfather was. So the lily was doing great then the flowers turned black with a white powder on them and the wilted. I thought it was a watering issue or root rot. I pulled the lily out of its pot and the roots are a light off white color and firm so root rot isnt the issue. The roots actually look amazing. Now some of the leaves are browning around the edges and some leaves are turning yellow. Any tips to save this amazing yet sentimentally important plant.