Best way to sell a timeshare!

My mom got talked into purchasing a "discounted vacation" over the phone through a company called Great Vacation Destinations. The trip is a few days in Orlando, FL and then a couple days on a cruise to the Bahamas, followed by a couple more days in Ft Lauderdale. The catch is that you have to go to a timeshare presentation for BlueGreen timeshares. And there are bonus vacations that you can take to Las Vegas and Cancun etc later on.

She now regrets the decision to buy, but has already shelled out a good chunk of money which I don’t think she can get back, so we are going to go check it out. I have heard lots of people’s opinions that all these types of offers are scams, and I would tend to give the same opinion, but is there anyone out there that has actually gone on this vacation with this company and could report on their experiences and/or offer any advice to ensure that the trip is at least a success, even if it’s not the great deal that they sell you on over the phone. Thanks!