I'm not great at questions like this because I don't really have a mental image of characters, I have a sort of cloud of traits and skills and foibles and goals with a nametag. I guess it'd boil down to something like: robes, boots when she's working or hiking, sandals when she's not, silver sickle in her belt, tanned arms and face, fit, about five foot even. Long hair that's tied back when she remembers to, a staff that takes root of its own accord so it's normally standing upright somewhere near her. A satchel on her side full of well-cushioned pockets for holding flasks and bottles that are usually full of soil and plant samples.
But if any of the above disagrees with anyone's mental image, feel free to keep your own.