So sorry about Little Bonnie. You did the best you could.
I know how you feel about unsavvy rabbit vets - it's frustrating when the vet you're seeing clearly has no idea about rabbits.
The final vet I saw was almost patronising - but that could have been a language thing. I had to try to guess what word he was saying - like some sort of sick charade. I did ask him to contact the owner who I had seen before, which he did and intensive nursing was recommended. I am going to change my vet but have been to all of the local ones. I get to find a bunny savvy vet and then they leave for one reason or another and I am back to square one!!
Thank you for your support everyone and for not judging me for failing Bonnie. I should have been more assertive but every suggestion I made was met with a reason why it wasn't do-able