First, Welcome!
If there was root rot, it may be that there's not enough in the way of good roots for the plant to hydrate itself. With fresh medium (you did exactly the right thing in repotting) it has a very good chance of growing some new ones. Remember, the fresh medium won't hold water the way the old stuff did, so you'll need to water more often. Water well, let it run through the pot and drain thoroughly. Feel the weight of the pot when you have just watered, then lift it again over the next few days - when it feels light, water again.
As for that small leaf... where was it? If it was a new one in the crown (the "pocket" where the leaves come together) keep an eye on things... if the crown is intact, it will produce a new leaf. But that's another place where rot can occur (which can be treated with a few drops of hydrogen peroxide)... can you take a photo that shows that area?
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