Hi Lighter.

Did you repot the Jade? The pot sounds awfully big for a small plant? Jades like being somewhat rootbound.
If you repotted, what type of soil did you use?
A few shrivled leaves are normal, but it shouldn't happen daily or even weekly.
Jades love sun and require well-draining soil. Cactus & succulent mix w/added perlite is best suited..
Soil should dry out thoroughly between waterings. Too much water or too little can shrivel foliage..

To root a leaf, well, this is how I do it..I remove leaf w/stem. Either lay leaf on soil or stick leaf, just barely, in soil..Again, you don't want to use a heavy medium.
I first water soil before placing leaf/ves in container. After that, I mist leaves until babys form. Then back to watering w/a container. The reason I mist instead of watering is as not to disturb foliage.
Keep babies in medium light..No direct sun, nor do you want shade.

About the mom plant, is she in a 6" diameter pot? Toni