I was also pondering the growing season in FL... OP mentioned a vegetable garden - there might be a way to expand that, perhaps have a small farm stand (look into permit requirements)... Perhaps offer gardening services locally, either helping folks start/maintain a veg garden of their own - or flower gardens. A big thing now is both native gardens and pollinator gardens. Another thought wrt the garden at home - herbs, that she could then sell (permit requirements, again) - fresh herbs are always in demand. Could also dry them.... Another option might be learning about medicinal herbs - there are online programs (I know Cornell offers one...) which could be useful to turn it into something profitable.