We're beating a dead horse! The bag is fake and if the seller sells as a second chance to the next buyer, she risks loss of her account! It's illegal to sell fakes and the seller needs to authenticate the bag, if not to convince buyers then to convince herself!Reply frm seller:Hi but i still can confirm with you its authentic no matter wat. if you don't want to purchase it i can let it go for second chance offer.
What's more, She asks me to go to coach together to authenticate?
If you feel like having "fun" and want to go to the Coach store with her and if it's not inconvenient for you to do it, go for it. She'll get the confirmation she needs.