I uploaded a ton of photos from a friend's iPhone before wiping her phone and transferring the photos to a flash drive for her to keep (I use the iPhone for myself now). But now all of her photos are interspersed throughout my photos on iPhoto and it is very bothersome. I need to delete all her photos from iPhoto without individually selecting them. Is there a function I can use to select all photos taken on a certain device before a certain time period or something? Thank you.