She is the author of Fun Time, Family Time and the award-winning Playing Smart. Flow is an altered state of mind that happens when you're so engaged in something that you forget about time, yourself, your surroundings, and your eventual audience.
Nothing matters then but the writing itself.
The great thing about flow is that it becomes self-rewarding. That is, you want to keep writing for its own sake, because it's so enjoyable. And for a writer who has to motivate him- or herself day in and day out, flow is the only way to go. The main way is to really care about your subject. That emotional involvement can be enough to carry you across the dividing line into flow.