Rug Rat

We've had this rug in the front room for a while now... maybe 2 years, maybe 3, I can't be sure. Anyway, for the whole time she has avoided it like the plague, jumping from one bit of furniture to another in order not to step on it, or taking the long route around the edge of the room. Except for the last few days when she has seemingly overcome her phobia and has started nestling in and sleeping on it. I have no idea why the sudden change of heart - funny little creature!