an appeal could take many months, and appeals have a success rate of about 66%..

long shot, i don't think the embassy will allow it thou, contact the caterer and get them to state on headed paper that the documents supplied were genuine, and that she had never received a call from the embassy, and try and contact the case worker and see if they will reconsider the visa app with a fax or scanned letter from the caterer., like i said i doubt it thou.