Thanks for the reply. But I've always used the same litter and nothing has changed - she has always shared with her "sister". The funny thing is that the only two times she has pooped outside the box was when I was in there scooping out the box.
Twice in a week, while I was scooping out the litter box, one of my cats has walked a couple feet away and pooped on the floor. She has never gone anywhere but in the litter box before, so this is new behavior. Lately she seems at times to want me to go watch while she uses the litter box.
