We have a thumb sucker!

Yes, my daughter is officially a thumb sucker..ugghhh!
She isn't a huge paci user, only when she is super tired and needed to calm down and fall asleep will she use it. So now, she will spit the paci out and go to town on her thumb. She went from sucking on her fist, to the inevitable thumb! I guess it's in the blood because both mommy and daddy were big time thumb suckers! I am determined to get her to take the paci and not her thumb. I will literally take her thumb out of her mouth and replace it with the paci - only to find 10 second later, paci out and thumb in!

Help me out! Duct tape perhaps? (totally kidding) but really...what to do?!