Grass matts, the rabbit safe kind, are a great alternative to put on the bottom of her cage. It will help give her traction for her feet, and safe if she decides to chew and nibble on it.
In my rabbit's cage, I do not have anything on the bottom. I just have his litter pan with litter in it, and the rest of the cage floor is bare. He loves it this way. When I did have grass matts and bedding on the floor, he pushed it out the way so that he could lay on the cool bottom.
Definitely do not use pine shavings in her litter box, as I'm sure you already know now. Paper pellet based litters are definitely much better and much healthier for her.
Hope this helps!
I am NOT, nor do I claim to be, a Veterinarian.
Always check with your vet for any symptoms your pet exhibits.
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