my 6 week old kitten eats its non clumping clay litter

at four weeks old the litter was introduced. she got in put her head down and immediately started eating the litter to which i promptly took her out. when i saw blood in her stool the next morning i called the vet first thing and brought her in that day. he didnt seem too worried, said the litter would pass and gave me some of their paper shreds they use in their office. she is using the box with the paper shreds but i think she likes to play with the little pieces more than thinking of them as a elimination area. also it was around the time the paper shreds were introduced that she started having dry sneezes. after she started sneezing for a few days i thought she might have cat flu or upper respitory but that would mean she would have runny eyes and nose too. i think its possible the sneezing might be from the paper. so last night i tried the litter again and she started eating it. any suggestions on other litter i can try that wont hurt her if she eats it?