Tritrich and earmites are as common as tails in the cat world.
Earmites are easily eradicated by Ivermectin, not worth mentioning in my opinion. There are many simple and quick cures available. During hot summer months they do tend to be around.
Tritrich can be eradicated by Ronidazole, correct dosage a must. It is not hard to administer. Put it in something yummy and the cat will willingly eat it. It is possible that diatomaceous earth also eradicates it. Yes, it is difficult to get rid of. It dies very quickly once it is out of the cat. Tritrich is hard to diagnose as infected cats do not always have mucous and blood in their stools. Tootsie rolls do not necessarily mean the cat's gut is clean. We like to think so though.
I have purchased several cats and all came with something...because stress of rehoming allows bad things to get control...just like us. No breeders were attacked. I took care of the issues myself. I knew a kitten or cat from someone else would have problems of some sort. Breeders give advice on how to introduce the cat to a new home and family to reduce the stress involved. Cats really like the status quo to remain the same...just like humans do.
I do not know any breeders in the cat world who pay vet bills. None. Be blessed that she paid any of your bills. You paid big bucks to solve issues most any breeder can handle economically and correctly, you declined taking her advice...at that point you became responsible, when you choose to use a costly vet instread of the breeder. She offered to take the cat back and treat it for you. You should have trusted her. She is a nurse and knows what to do. she is an honest ethical person. everything would have been better for both of you if you done whatever this breeder asked you to do. The issues are not unto death, just irritating.
Vets are necessary but people breeding animals know a great deal about medical issues concerning the animals they own and raise . Experience is priceless.
Karron Taylor has quality Bengals from excellent bloodlines. She is an ethical breeder. Her cats are well cared for. She is also a very honest, kind and helpful person. I would purchase a kitten from her in a heartbeat as I know she stands behind her kittens.
I know you are frustrated and upset, I am sorry for that. You should have let her solve the problems as she expected to. Often bad things happen to good people.
I hope your kitty has a long healthy life, I hope you and Karron make ammends. Life is short. When folks refuse to forgive they are the ones being hurt.