Neither I, nor my parents can drive, and they survived for more than sixty years, went to work every day and raised a child. It's not practical to travel by car where I live, in a European capital city, we use public transport or bike/walk. I know it's hard to imagine for someone from the US or Australia for example. However Ruby refused to go to her workplace by bus last summer and relied on her parents to drive her everywhere, so she clearly prefers travelling by car, that's why I think she should learn how to drive. The dependency is the problematic part, not that she doesn't have a driving license, in my opinion.