Thank you for adopting a bunny!
Feline pine isn’t good for bunnies because of the heavy scent. The vapours can hurt their airways. Wise little girl Phoebe to try and avoid them!
I use hardwood stove pellets, they are for heating houses but works excellently as bunny litter. You want the type that has no accelerants added. The pricing is nice and the used litter can be composted.
Another alternative is Yesterday’s News, that’s paper pellets. Aspen shavings for cats is also good.
I buy my alternative hay from Oxbow. Botanical and, I think, meadow has some timothy in it, but orchard and oat hasn’t. I find orchard to be especially dust free.
Other types of hay are f ex fescue, rye grass (not related to the cereal rye) and Coastal (Bermuda grass). Those hays are often sold as horse-hays, but they are ok for bunnies. You want to avoid hay for cows, it can be of sub par quality (cows can eat lower quality hay because they process their food in their foregut. Bunnies and horses are hindgut fermenters and as such more sensitive).