Re: How often??
As long as she is still producing adequate wet and poopy diapers in a 24 hour period and seems healthy, it's okay to follow her lead even if that means she nurses less than the 8-10 times/day standard. Most babies cannot routinely go 3-4 hours between nursing sessions, but a few can.
What would happen if you offered the breast every 2-3 hours during the day? You might have a rather undemanding, mellow baby, and if so you might want to prompt her to eat a little more frequently.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"