I doubt that the Vet would ask you to bring her back in just to make money. Most Vets really are not made that way. In order to prescribe any medication a Vet must keep clear records and this includes how and why repeat prescriptions are authorised. The Vet usually needs to actually examine a Rabbit at regular intervals when they place said Rabbit on a very long course of treatment. In recent times this especially applies to the use of antibiotics. Over prescribing of abx can be as much of a problem in Veterinary medicine as it can in human medicine. Also, with a longterm condition many Vets will not keep adding a Consultation fee to all the check-ups, or if they do it will be at a reduced rate.
All that said, if you do not have trust in the Vet you are seeing then maybe it would be a good idea to seek a second opinion from another Vet at another Practice. However, I personally think you already attend an excellent very Rabbit Savvy Practice. But my opinion on that is irrelevent if you are not happy with the service they are providing.
Best wishes for whatever you decide is best to do for your Rabbit