She didn't pay for them individually, she paid in one transaction, just didn't wait for the postage reduction.

The other items she's bid on come to nearly the over payment. It's tempting to send her a message saying I am ending the items without sale and I'll send them with the others. EBay would still be getting their fees the same as if they sell at auction. I'll sleep on it and decide in the morning. At least that way I don't have to refund, she still gets the other items she wants and eBay still gets their fees.