omg you must be so excited! I hope your daughter takes a nice lonnnnng nap, lol!
My kids used to sit right on my lap while I sewed, until they got too big to fit. As they got older I would let them remove the pins and put them in the magnet or pin cushion and that kept them occupied for a bit. They learned to understand the process and I let them sew their own little projects as well. Now I'm doing that with my gs but he's a bit more restless!
You are going to love your Janome!