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This may be a good time to divide your Calla Lily or simply increase the pot size and give your plant more room to grow.
Use good quality potting mix and a container with a good drainage hole. Only go up 1 to 2" larger in size on the pot.

Here are a few links for you.

https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/transplanting-calla-lilies.htm

https://www.gardeningknowhow.com/plant-problems/environmental/root-bound-symptoms.htm

Just prepare the planting hole around the same depth and give them the same care as the area they are currently in. Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/flowers/calla-lily/growing-calla-lilies-and-care-of-calla-lilies.htm

If you're in an area where overwintering is necessary, dig them up in fall, store them over winter and then replant to their ne location in spring. Otherwise, you can go ahead and transplant in fall or spring.

Have you overwatered or over fertilized your plant?

Do the leaves pull out of the plant easily? It could be root rot.

https://www.gardeningknowhow.com/plant-problems/disease/treating-root-rot-gardening-tips-for-housplants.htm

https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/growing-calla-lilies-and-care-of-calla-lilies.htm

Your Calla Lilies will enjoy the summer temperatures but you will need to water twice a day when temperatures are about 80 degrees F.

Here is a link to the proper care.

https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/growing-calla-lilies-and-care-of-calla-lilies.htm

There's no need to worry about the green color. These flowers do that as they mature and begin producing seeds. You can cut them off or leave them be.

Here is a link that will help.

https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/dividing-calla-lilies.htm