I've had this recently too
regarding her purchasing an item from another seller for an item I'm after in exchange for something on my trade thread. I've held that item for like a month. After writing :URGENT, RESPOND" in the title I finally got a response.
I don't really have enough money to trade now, I did when I first contacted her, but it has been so long that I can't keep the money that long. I had clothes to buy. Next month I will have money, but not now.
I really think you need to be persistant. I trade with Sao lots, but the waiting can take a long time.
Hope you are Ok Sao, would be good to hear from you! X