Yep to the above. If she doesn't check out through Paypal she cannot leave feedback. Another note: you can't just set up one item for "other" type of payment, you have to temporarily set up your whole shop to accept Other.
Here's a custom listing I did recently. Hey, this is weird...up until a couple of days ago, the first photo was the one which says "Custom Order." That item had already been sold, but now when I look at it, the photos are re-arranged (not by me). So, heads up...I saw this reported elsewhere in the forums so yikes; I'm going to check my other listings for photo-rearrangement.
Anyway:
http://www.etsy.com/transaction/60108853Also if you have a buyer who purchases but not through Paypal... in a case like this... i.e. you sell the item locally instead, you have to make the item inactive.