well i have heard a lot about hanging toy baby keys *really hard plastic and durable
either keys or just interlocking rings..
for digging throw a cardboard box in her cage and put in shredded newspaper so she can shuffle it around.. *it gets messy but its a fun, cheap option.
OR! if her cage is big enough throw in your normal yellow pages phone book and some bunnies enjoy shredding the pages.. just be mindful that she doesnt eat too much of the paper.. the ink could be harmful.
i personally have a hanging twine string that has different shapes of wood *untreated!* they clang and he can gnaw on them. and he has to put in effort to reach up to play.
try a trip to toys are us and find jangly clangy HARD plastic toys to hang in her cage.. they're safe long lasting toys,