Master Line: With the exception of the carbon and low-end promo handle, all are available in small diameter (1"). Price about $90-$50 with about $10 shipping. A slalom handle can be as small as .88" dia and 13" long. Works great for kids or very small hands. However, it sinks.
Straight Line: MiniGrip is 1" outer diameter - various models from $90 to $60 (Launch for wraps, Wake for floating, Featherweight for sinking, and stiffy for some body to the handle "V"). Shipping is about $10, depending upon zip code.
Most other handles are 1.1 to 1.125 inches in diameter. With smaller hands, you want a firmer handle. Too soft, and you will not get a good "feel" for handle passes. Also, the inner bar diameter is really small on some of them, making them much more fragile.
If you have a local shop with SL or ML, go to them. If not, let me know and I'll help you out.
If you want detailed info -
rider@boarditup.com.
Good Luck