We have a wonderful neighbor who has been like a second mother to my 11 year old daughter?

My neighbor and I have been trying to think of a good nickname for my daughter to call her that kinda meant "second mom", but wasn't "mom" or "aunt". Something cute and bubbly ( like my daughter). So we've thought of, and decided against the following names: Nana, Mamie, Mimi, aunt, STEP MOM, etc......please help us pick out a name!!!!!!!!!!!!!!!! Thanks for your input!!!!