i think you should cancel the transaction,so far shes tried to low ball you and then she went and turned it around and bought one bag and wants the other at that price,i would just cancel she seems to be trouble,i think somethings fishy its sad to say but i would think what in the world is she going to do if and when she gets the bag,she most likely going to throw a fit when if it dosnt get there on time and lord knows what else she comes up with,buyer just seems like a headache already,cancel now before the headache becomes worse.

(good luck with whatever you decide to do)