[My baby*Fergie*]

I have trained Fergie to go in a litter box..she has been doing very well....surprisingly well....now all of a sudden she is peeing in different rooms. She has never done that before...I have watched her walk from the furthest room of the house all the way to her litter box..and never seen her seem like she would want to go anywhere else. She has peed and pooped on the floor....I am very upset ...I felt like i was on the right track ..now its like starting over or something..why in the world would she start this....Can anyone help me out?? this is hard...i love her to death...its just frusterating. Thankyou