Q.How to revive a peace lily
I have a large peace lily that is 7 yrs old. I repotted it into 2 pots and none of it has really perked back up. I really want to save this plant since it was my Mother’s. Any suggestions as to what I can do please?

How long ago did you repot this plant? Any kind of move or transplant is a shock to a plant's system and it takes a period of time to recover. Here is an article on transplant shock that may interest you:
https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm
Conditions for the peace lily may be too wet or too dry. Feel the soil - if it is dry, water your peace lily. If the soil is still damp, the plant does not need to be watered.
For a refresher on the care of peace lilies, please visit the following link:
https://www.gardeningknowhow.com/houseplants/peace-lily/peace-lily-plants.htm