well if you keep trying to predicted when she craps (4 days for me depending on temp)u should get quite good and then you shouldnt have to use papper towels for very long as they will do most of the crapping when you take them out
but then again, most substrates clump together when soild and are easly scooped out.
Also the type of cage you uae could make a difference, glass is very easly cleaned, a cage would not hold the smell in, my viv is made from wood but i keep it in my bedroom anyway with out to much problem.
Remember, LOTS of handling should dtop her musking you