This is a very interesting article that will help to shed some light on "sun purple" glass. The article describes the natural cause of turning glass purple and how it began somewhat of a "reasoning" for buyers wanting this type of glass. As the article explains, the process of trying to turn glass purple is not new among dealers and is based on greed, but possibly with today's technology, they can do it much quicker :(
Sun Purple Glass Antique Disaster
Well she surely must be passionate about this issue to pay for a listing to warn buyers of the deceptive practices going on in this area of collecting. I don't think she really wants to sell the item, but rather bring attention to the issue and if that is her intention, I commend her effort.