How to switch to a new type of cat litter?
Change the litter gradually.
Gradually add some of the new litter to your litter box every day, replacing the amount you scooped out. Watch your cat's reactions without making a huge deal of her litterbox habits. Don't "ooh and aah" over her using the new litter, just keep things relaxed and as normal as possible.
If you think your cat seems distressed or suspicious of the new litter, slow things down a bit. If the cat seems oblivious to the change, continue to add more of the new type of litter until the box contains only the new brand of litter.