Why does my cat avoid her 'familiarity' blankets?

A couple of weeks ago, I got a cat. The home I got her from gave me some blankets and a piece of carpet that she had been sleeping in and scratching. They told me the familiar scent of the blankets should help keep her calm while settling in. However, no matter where I put the blankets, she will not go near them. I tested this by laying them out in the hallway, and sitting the other side of them. I called her, and she trilled a few times before eventually cautiously walking over the biggest one, and then only past the others.

I find this all puzzling, because she was resting on these same blankets when I went there to pick her up, and had them in her cat carrier with her on the way home, and showed no sign of aversion towards them at those times. I'm only bothered because I'd like to set up a comfortable and familiar spot for her to chill in, as a decent alternative to the hard window ledge and the shelf under my desk (two early favourites). Putting the blankets in those places causes her to avoid the places until I move the blankets.