It sounds like your
plant is shot.
![frown frown](/old/images/graemlins/default/frown.gif)
Jades are usually very easy
plants to grow, with hardly any common problems. With one exception, that being mealy bugs, and it is very easy to tell if you have a infestation of them, as they look like little white tufts of cotton. Providing you are giving it indirect sunlight, and as long as you don't have it in a drafty area, and you let it dry between waterings, they usually do very well. Yours may have been damaged when you brought it home.
![smile smile](/old/images/graemlins/default/smile.gif)
However you can take some of the leaves and start new
plants. All you need to do is take the leaf and place it face up, on a bed of semi moist potting soil, give it some good light, and within a week or so you should see some new growth appearing from the stem area. they are one of the easiest
plants to propagate from leaf cuttings. Hope this helps.
Mike