Should I put my rabbit down?

I have a rabbit who recently developed abscess' on her face. I took her to the vet to see if she could be treated professionally but the bill was $900 and we do not have that money. We had the option to try to cure her at home though. The vet gave us medicine and instruction on what to do with my rabbit. The bumps filled with pus were going away, but they came back about a week ago. Whenever I squeeze out the pus, she jumps and tries to run away... So I know she's in pain. I HATE seeing her like this. I love her, so I'm willing to have her put down if that's the only thing that will stop her from suffering. It pains me to think about it, but I'm just confused. Would it be a good idea to put her down? The abscess would just keep coming back and I'd still have to do the same process over and over. How much does it usually cost to have a pet be put down? I know prices are never set, but what's the average? Thanks.