Children are very curious creatures:) This liitle 2 yr old is just enjoying what happens when water is poured on the litter, feeling the textures, and like you said - just having fun.
But, playing with kitty litter isn't sanitary or safe is it?
Is your cousin able to get a small sandbox for her daughter and let her play with it outside? Or even set up a messy time area in the kitchen? Get a cheap vinyl tablecloth, spread it on the floor, then get some plastic bowls/containers and spoons and put dried beans, or flour, or rice, in a large bowl - and just let her play. Kids love dumping and scooping and squishing:) If she is still putting things in her mouth, mom will have to keep an eye on her..or sometimes a bean will go in the ear or nose! Supervision is pretty key in this type of experience. It's messy, but there is alot of learning going on with this type of messy play. If mom isn't able to or doesn't want to do this type of messy play in the home....getting daughter to the park with a shovel and pail and let her go in the sand will probably put her in heaven! It's also still warm enough for some fun water play outside...just give her some water in a few large bowls with some cups and see how happy she is with that;).
Mom can say "NO" to the kitty litter all she wants, but she needs to say "YES" to something else, otherwise her daughter will just want to keep playing with whatever it is she can't play with unless she's redirected to something more appropriate and just as fun.
Sometimes we need to just say a big firm "NO" to our children because of immediate danger. Most other times, our children will benefit when we take just another moment to explain to them why we are saying no. "This is for our cat, it is where he goes potty. It is not for you to play with. You may play with _____." Then actually walk child to another activity in another part of the house.
Much good energy for happy and Messy playtime:)
In peace,
A.
mom of 4, Birth and Parenting Mentor
www.birthingfromwithin.com