Please help Ms. bad bunny get medical attention

Hi, my name is Patsy and I’m raising money to cover medical attention for this bunny I found outside. I have no idea as to how she got outside but she’s friendly and needs medical attention. Her foot when I found her was very swollen. I brought her to the vet where they did a few x-rays, a physical exam but couldn’t find anything broken or any scratches. I was sent home with two antibiotics and an anti inflammatory. She started to have an alarming amount of puss and the vet says that she needs a culture among other treatments that I unfortunately cannot afford. Most shelters and rescues are at capacity and I really want her to receive treatment she needs or at least figure out the cause of her Infection. Please help me, help bunny get medical treatment. If anyone can do more to help her than I can please reach out!

Thank you so much