R.G.
I was a thumb sucker until I was in elementary school, and even then, I sucked my thumb at night until I was 12 years old! Don't worry, I am a very healthy, happy adult these days. I would suggest getting her a special stuffed animal that she can hug for comfort. Also, wrapping it with band-aids is something my Mom did. I think it is one of those things that you have to just keep positively encouraging her not to do, but you can't force. It's a security thing...