Are you taking about a smell from urine or odour from rabbit itself??
If it is from rabbit itself get your self some Dynamite it is a concentated solution you dilute into a spray bottle and work some through her coat each day. It has a lovely lavender smell and will do her coat loads of good as well as keep her smelling sweet.
If however its her urine try using Keep it clean Lavender hutch spray it is used as a cage cleaner but also is a deoderiser and once you have cleaned your
litter tray out you can spray a little on shavings and in litter tray which helps keep the urine smell down.
Lavander products are really good for this kind of problem' but id also make sure any urine was not an unusual colour and rule out any chance of an infection in the water works.
hope this helps you and your buns.
