I would avoid anything made from cardboard at the moment until she is older and her digestive system can handle it, instead stick to natural materials. The Woodlands range at Pets at Home are good as well as the Rosewood Boredom Beakers range which you can get on the internet (Amazon, Hay Experts, Ebay).
My bunnies love tunnels and things they can throw about. You can buy fabric tunnels and tents from Rosewoods, my bunnies love them.
Also other 'animal toys' may be okay, I have plastic balls with bells inside (cat toy) and shapes linked together (it was a parrot toy). Baby stacking cups, rattle keys or shapes make good throwing toys as well.
I also recommend getting your bunny a teddy bear. They are great comfort aids for your bunny especially if they are on their own. And then they can be used to help get your bunny used to another bunny if you plan on bonding.
