Q.Calla Lillies
So have a plant of them that were in a pot but got overwatered cause of no draining. So I transplanted them in a bigger pot and added soil that didn’t do much so I redid it again today but added rocks in the bottom to help drain water. What can I do they were doing so well and stood so tall now they hang and droop and some stand. I have them inside also and by a window that has both shade and sun.

If the bulbs are soft and mushy, it may be too late to save the plant.
Well draining soil and a container with drainage holes are necessary for success.
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/drooping-calla-lilies.htm