I sell on etsy, (as you already know:)) so check a few different things. Do you have the order number from etsy in your email? They always send an email when you purchase something, that might be an easier way to track it down. YOu can also search her sold items too, maybe it will show up in there too!
As far as paypal going too, you might have to adjust the search, sometimes it only shows a month but you can usually go back much further too.
Hopefully that might help