hi tazz,
I don't know if this is helpful or if it is too late to post, but my Pippi used to eat a bit of her Carefresh litter until I started putting a lot of timmy hay on top of the litter in the box. it seems that she really just prefers the hay now and won't touch much of the carefresh.

perhaps this would work for the mommy bunny. plus, putting hay in the box promotes hay-eating, and ingesting fiber is so vital for buns:-)

take care!
~Jess