I had the same problem...I had to let Caesar pee somewheres...wip it up with the peepad..then leave the peepad somewheres that he would be comfortable using it. She will come to her own smell. Try it..it really works. She might be scared to pee on the peepads if they are clean. She might think it is a "NO" zone.
If this doesn't work.....Rip out the carpet!!! LOL Give her some time. She will get use to them