Re: Introducing Nursing to a preschooler
It's certainly possible to get a 4 year old to nurse again, but I honestly think it's fairly unlikely that she'll a) re-learn to latch and b) enjoy nursing so much that she'll do it enough to really impact her calorie intake. When kids nurse into the preschool years, it's usually because they never stopped.
Feel free to offer, and see if she's into it. If not, you can always break out the pump and start giving her breastmilk in a cup.
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!"