Q.Droopy and Yellow Leaves on Calla Lily
I received a calla lily as a present and I followed the directions it came with saying to keep the soil moist. It started out strong, but it started to droop, continuing to droop further and further and now leaves are turning yellow. I have tried watering it more and also waiting longer periods between watering. I’ve also tried keeping it inside next to a window in case it was too hot outside, keeping it outside in the direct sun, and also keeping it outside in partial shade. Nothing seems to make it happy. What am I doing wrong?

These articles will help you.
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/drooping-calla-lilies.htm
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/yellow-calla-lily-leaves.htm