This is a tangent, sorry, but please explain your evidence that where you bought the ipad made a difference in how you were treated by the Genius?
MSUSpartan: if you've not yet done so, do familiarize yourself fully with the ebay policies. If you complete the deal in person, may sure to keep the email chain between you and selling showing clearly her acceptance of doing this -- and after it's complete I'd even send a followup "thank you for meeting me and accepting payment in person" email just to have in the record. That way should she later try to claim you didn't pay or something (to get out of paying ebay fees), then you have a paper trail showing you did.
deeddawg, thanks for the tip! She's being REALLY flakey in terms of communication so I'm not sure what to think at this point. I kind of want her to cancel it and leave it at that. I don't want to jeopardize my eBay feedback/rating.