colas said..
Extra width is also slower to paddle, and has more row for short people (they have the paddle blade well outside the center).
I would differ with MickMc, plenty of brands make boards for lightweights. Just not the brands geared for the overweight US market...
LRO, my daughters are your size, and were fine on 28.5" wide boards, you can go up to 30" I guess, not too short for an easy take off, but not too long as not to be cumbersome: something in the 8'6" - 9'6" range. around 110 - 120l would be fine
Sorry Colas, maybe I didn't express myself clearly enough. I agree there are plenty of boards out there for lightweights. I'm saying no one makes a wider board for lightweights. The wider boards add stability on the less than perfect surf days .... as in most of the time. I prefer a narrower board on a good surf day and certainly wouldn't go wider than 30", but if it's really lumpy with a cross swell then a little extra width is what you need ..... just not the volume.