What are you saying, I shouldn't use sawdust but if I do I am harming Bella?!
Hay and newspaper are perfectly adequate to use for rabbits and most small animals.
What I am saying is that there is potential for problems to occur to many small animals if they are bedded down on sawdust. I have had many guinea pigs in who were bedded down on sawdust who had skin problems, after treating them with antifungal lotions and potions and then rehoming them into a no sawdust enviroment they have remained with good skin. I have had a couple of rabbits in whom have been sneezing who lived on shavings, with a no shaving envioroment they have stopped sneezing. Rabbits searching through shavings will breath in the dust, this is not good for them ... this is the same as you living in a dusty envioroment.
I am not saying that you will harm your rabbit, what I am saying is that they may have a healthier life with less problems if you dont use it.