why r cats so fussy about wot litter u choose for them

i had cheap co op stuff,granules.
then i ran out,i was given by a neighbour litter she'd had,she no longer needed it coz he cat had to be pts a few days ago
i usually use THOMAS litter,this stuff i got from my neighbours she got from her vets,its wood chips,cass the younger cat doesnt like it.to prove it,she pee'd in the hall
fortunately i have laminate,so not too bad

but still !!!
she will just have to cope with it till tomoz when i get some thomas,i just hope all she does is pee mean time,wont feel to happy if i have to clear up anything else,from under a bed
