So far this has only happened to me once (smearing on a wall) and it was at about that age (2yo) too. I can't recall what i did or didn't do as it was with my DD (10 years ago now).... but I probably would have made a bit of a fuss... but not gone over board. The suggestion of 'difficult to remove' clothing sounds good.... maybe put her in some overalls?

When I worked in a 0-2 room we only praised the good and ignored the 'bad' as much as possible... however I agree, that's probably a good place to start making inquiries although they could deny criticising the pooey nappies at all. Good luck, let us know how she goes. You could also try the old trick of a sticker chart for times that she does poo without touching it with her hands?