Ah, Manda honey, I'm 51 and I still feel like that sometimes.
Actually I think the best thing about being the age I am is that I don't worry too much about being "immature" because of feeling this way sometimes; I've taken to going to bed with a collection of stuffed toys again!
Although there are times when I "want my mummy" and of course mine isn;t around anymore (not that I could always rely on her) and I find it difficult to accept a substitute.
Talk to little Manda; she sounds scared & lonely. Perhaps you can comfort her?