The smaller Jackson Fun boats would be a good bet. They are really the only truly “downsized” boats on the market right now. Everything about them – weight and hull width especially – make them well suited for smaller paddlers.
You really want to look at two things
1. Matching your weight to the volume of the boat
2. Matching your shoulder width to the planing hull (bottom) of the boat. Paddlers with narrower shoulders usually get better performance out of a boat with a narrower planing surface. A good example is the Kingpin 6.1. It’s not just a downsized version of the 6.2. It is quite a bit narrower, and almost as long as the 6.2.
You really should try out a few boats. You will be surprised when you feel the difference between different designs.