You could probably cancel selecting the reason there's a problem with the buyer's address.

Since there has been some form of correspondence between you and the buyer its likely that the bots won't issue you a defect I would think.

She is probably unlikely to approve the cancellation request and may indeed do nothing. In which case after 10-days it times out and your fees will be refunded.

The other way to do it is to hope she still does not pay then issue a non-payment dispute after exactly 4-days, then after another exactly 4-days (if she still doesn't pay) close it.

If she pays somewhere along the line then you have to send the item and hope for the best I reckon.