Question
About two weeks ago I repotted what was then a very healthy 8-year-old but small-sized (about 8 inches tall) peace lily.  
It had been doing well in indirect, low light rather far away from our bright, southern-facing windows.  I used to water it once a week.  I had no problems with the plant at all.

I put it in a much bigger pot (which is about 10 inches in diameter and 9 inches in height), filled with regular potting soil.  After a few days, it wilted badly, and nothing I've done since has helped it.  My next mistake was overwatering it.  Then I discovered your previous posts addressing others' difficulties with peace lilies, so I stopped watering it until it was completely dry and the pot was light for three days.  A few days ago, I watered it for the first time with tap water that had been standing out overnight.  I've also moved it to a brighter place (indirect light) in the hopes that this might help.  The plant is still very wilted, the leaves are dying, and I'm afraid I will lose it.

Based on what I've read online, it seems that the pot is too big for the plant.  Should I repot it again, to a smaller pot or even the one it had been in?  I'm uncertain how I can help it now.  Will repotting save it or possibly make things worse?

Thanks so much for any help you can offer.

Answer
Amy,

If I were there with you I would reccommend that you very carefully repot it back into the same pot you took it out of. Of course wash the pot first. Be very careful to try to do as little damage as possible to the roots. The less damage to the roots the quicker the plant will recuperate.  Dwarf Peace lillies are plants that like to be root bound. It should never be in a pot with a diameter more than 6 inches. If it gets very full and rootbound in that size pot unpot it and remove an small section of it and put that section in a 4 inch pot. When it fills up the 4 inch pot move it to a 6 inch pot. Youshould never move any plant to a pot more than 2 inches larger than the pot you are taking it out of or you risk having the same porblem you are having right now. Over potting plants putts them in transplant shock and makes overwatering too easy.

After you get it back in the old pot set it about 6 feet from those south windows. Bright south light will actually help it recuperate a bit faster but it will still be a slow process. If the leaves turn brown trim them off but don't give up on the plant. Do not keep it wet but don't keep it bone dry either. Give it 1/2 cup of water a week or so, just so it is not totally dry. Hopefully you will see small new leaves within a few weeks. It will come back slowly. I overwatered and almost killed my dwarf peace lilly late last summer and ended up cutting almost everything off. The pot is now full of short new leaves and sitting next to an east facing window so it gets sun in the morning and swhade the rest of the day. It is healthy and happy and I am very careful to only water it when it is DRY! They are very resilient plants, get it back into a smaller pot and even if it looks dead give it time and it will come back. Good luck.

Darlene