I think your jade has mealy bugs. Use a cotton swab (Q-tip) dipped in alcohol to physically remove all the bugs/cotton-like material you can find. You will have to re-do this weekly for perhaps 2-3 weeks to eliminate the pests.
You are probably over-watering your jade. It is doubtful that this small plant is root-bound, and to tell the truth, jade's won't have all that robust of a root system anyway, and you probably can't get it root-bound. The reason I repot is because the jade's get so large and top-heavy, that larger, heavier clay pots are necessary to keep the plant/pot from tipping over. Your tall plant is getting to that "tipping-point". I water my jades once every-other week (or less) during the winter months, and don't fertilize at all. I will fertilize all mine in a month, and will use 20-20-20 diluted to 1/2 the stated dilution rate. Usually that rate is 1 tsp./gal., so I'll use 1/2 tsp./gal.
Jades, like most other houseplants, need air circulation. This eliminates most pest problems. Just a small fan will do wonders.
P. S. Your jade will actually tell you when it needs water. Watch for the leaves to begin shriveling a bit. Water then. Also, be sure you have well-draining soil and don't allow your plant to sit in a saucer of water.
