Looking for a children’s chapter book from the 1960s or early 70’s about a tree in the forest that has special powers. I recall that the vines were alive as was the tree – but I recall only a girl in the story could communicate with the tree and either visited or lived beneath the ground by the tree? For some reason I recall descriptions about being under the ground at times. I don’t think it was a scary tree. More like a friend and protector to the girl. Would love to track it down if possible.