White Vinegar on the spots she has gone should mask the smell and discourage her from going there again...

Um, otherwise can you place the "poop sheets" in various places round the house?

But I think you will have to be vigilant and watch for the pooping signs (sniffing etc) and use the lead to take her to the sheet and wait with her till she goes and then give the big praise and encouragement. After food is a good time, and if you watch her you will pick up on her rhythms, and know the times to lead her to water (so to to speak)... The book we used with our puppies was The Perfect Puppy by Gwen Bailey. It was a great resource.

If you catch her about to go a quick sharp clap and NO should stop it, and you can quickly lead her to the mat and encourage her to go there and then praise again...

Good luck. TT a puppy is not easy, but worth perservering...