Doggy Diamond Surgery

Diamond is a 13 year old pitbull. She has a 3 year old sister and sometimes it makes her feel like she is way younger then she is. One day just such a thing happened and they jumped onto the large ottoman to look out the window to see who was here, only Diamond in her happy energy missed. She nailed the corner on her tummy and one of her nips got hurt. We could not tell at first. Once we noticed it we kept an eye on it to see if it was going to get better, It was small. But it became infected. So with our last bit of funds we took her to the vet, got her tested and put her on meds. It looked like it was improving and we were very happy about this because they had spoken of a surgery she may need.  Time went by, she took all her meds. It was looking way better and we figured she had turned a corner, up until about 3 days ago.  Now we have to take her back to the vets have her seen again. The surgery is almost 1200. This is not for us, this is not for her people. This is for Diamond our wonderful fur baby. We will be posting picks and info. Please help us help her. We don't want to lose our baby girl. But this is not something she can just live with. She needs this surgery and if we could pay for it, we would!!! We are going to keep everyone up to date. Please help, Any help will help.  The wound as of July 23, 2020. 
The wound just days before the original appointment, August 22, 2020.
The wound as of today, September 22, 2020