Avengers, unique

You all know Pepper Potts, assistant to Tony Stark, girl friend, co worker, smart pretty, oh and did I forget to mention mother,
From a previous relationship Pepper has a six year old daughter, Satori, very advanced for her age, bubbly, kind, thoughtful,
Pepper has kept her a secret from not only Tony but shield and the avengers, what happens when that gets shattered when Satori shows up at avenger tower,