Yeah I read that about skunks too, thought it was quite funny. It's weird, it reminds me of when cats do it with their claws out, isn't that something to do with making their beds more comfortable? I've never had cats so don't really know what it means for them either. It could be territorial, she most recently did it just after her sister died so it could be her way of saying 'this is mine now' maybe? Her sister was the more dominant of the two. Also, on a similar topic i've noticed that one of her arms vibrates/shakes a little when she drinks or eats something sour! Again, I don't think it's a bad thing, I just love watching their strange ways
