Apparently, Danny and Tucker must have deeply informed Sam about Desiree, since she was able to tell that the ghost in the school was Desiree and that she grants wishes, despite the fact that Sam never encountered Desiree at all in "What You Want."
Please read the following before uploading
Do not upload anything which you do not own or are fully licensed to upload. The images should not contain any sexually explicit content, race hatred material or other offensive symbols or images. Remember: Abuse of the TV.com image system may result in you being banned from uploading images or from the entire site – so, play nice and respect the rules!