Mojo likes to play in the box whenever I add litter to her "sandbox".
Sometimes that includes laying in it.
Thankfully, the laying in it part has gotten less and less as she's gotten older (she's about a year and a half or so), but she does like trying to catch the litter as it's being poured. Then she gets mad when I have to brush litter off her back because she jumped under the stream of litter. What a goofball!
All that is to say...your Pepper isn't a total freak of nature, and she'll probably grow out of this icky phase. (That is if I'm seeing her picture correctly in your sihnature as being fairly young.