Thank you for contacting Just Answer. I am sorry to hear about this. Hoarding isn't merely someone who is messy. It is an obsessive compulsive disorder that needs help. You may want to go to this link and read what it says about hoarding. Also, there, you will be able to search for a company that helps people clean up their clutter. http://www.compulsivehoarding.co.uk/articles/dealing-with-hoarding-obsession.php
Take a look also about what is said about hoarding being a psychiatric condition. Reading these links may put you in a better position in trying to offer your daughter help. If you understand it better, you can be in a position to help her understand better. Perhaps you can read the information I am sending first and then see if you can go over it with her. http://www.suite101.com/content/the-dangers-of-hoarding-a35709
I see that you are offline. I'll pause here and await your response so that we may continue with our chat.