She left her flats near the door and while they were upstairs I "went to the bathroom" downstairs and brought her shoes with me. They had a great aroma, not too strong but definitely there. As I was about to take a picture of my finished work, I heard their door open upstairs and quickly had to wipe and return the shoes.
Its hard to get the feel of the girl involved. Since she is your friend's gf, take a picture of them together. You can always blur their faces when you post them for us to see.