I don't think you will find a definitive answer on this one. I have the same shot signed the same way in 1994 or 1995 TTM. While there are strong similarities with inperson signatures from 1995 and 1996, everything changed after that. I do not know of anyone who can produce an inperson sample that is an exact match to these mid 90's mail pieces, they do have the benefit of being the earliest signatures fans saw from her. The slight variances can easily be the standard evolution of her autograph.
I haven't shredded mine and I do have faith that it is very likely real.