I'm so sorry you are going through this! Our little Brie was really sick a while back, and we were told she had a tumor in her uterus, and that the very rabbit savvy vet could try to remove it with surgery, but that once she got in there, if she determined it was too severe, she would just put her to sleep. The charges would cover whatever anesthesia and other expenses they incurred up to that point. However, when she got in there, she had pyometra which is a type of infection in the uterus. We felt really bad that we didn't have her spayed early on after hearing this. However, she was overweight and our vet was concerned with doing the surgery until we could get her weight down. What we didn't know, was that part of the reason she was so heavy and bloated was because of this. We should have had her spayed really early on when we first got her and we could have spared us all the problems. Thankfully in our case, our Brie's uterus had contained everything and there was no sign of anything else when the tests came back. She did go through a bout of pneumonia not long after, but she is doing very well these days.
In my opinion, if you want to let her go, it is better to have the vet put her to sleep. Don't let her starve to death. And if you cannot deal with her health issues, don't have the time or money to invest in her care, or you don't want to put her to sleep, consider contacting a rescue in your state or a nearby state. Some rescues will have more resources to take in rabbits like this and give them medical care. Our vet works with a rescue who would do this if an owner wanted to surrender their rabbit for any of those reasons.
Have you checked to see if there are any rabbit savvy vets or exotic vets that are within a reasonable drive from you? I wouldn't treat her with Revolution if she is that sick, but that's just my opinion, and I would definitely ask a vet's opinion over mine. How hot is it getting there? I know we are going to be near 100 over the weekend. I would not even consider keeping a rabbit outdoors if it's over 80 and humid. Even if you put a fan on them, frozen water bottles, etc., they can get dehydrated way too fast.
Again, I'm so sorry you are going through this, but consider putting her to sleep if you feel like she is not getting better and you don't want to put her through surgery. No need for her to suffer. Before I considered that, I would try hard to find a rabbit savvy vet to get better answers, and then consider a rabbit rescue. Everyone has to do what they feel is right though, and what I think could be different from what other people think.