I agree with Penny about having her checked by a vet. It definitely sounds like she doesn't see very well and if you find out what's causing it at least you'll know if it's something that can be corrected by surgery (most cataracts can if caught early enough) or if it's something you can do nothing about.
Most dogs adapt to lack of sight very well, but it would be good if you knew how poor, or not, her sight is, and if it's likely to remain the same or become worse.