Unfortunately, she passed away last night. When I found her, she was floating and already appeared to be in poor condition. I gently squeezed her to check if she was egg-bound, and a number of scales came off along with a brownish-red goo. It looked like there might have been internal bleeding or something similar. I'm not sure what happened. There hasn't been much spawning activity lately, so I’m unsure about that, but I also thought the internal bleeding could be related to spawning.
All the other fish seem fine at this point, but I added some salt and cleaned the pond just to be safe.
I tried everything to help her. We gave her a small Baytril shot, added a little salt to her water, provided aeration, and used a light bacterial treatment powder in the water. She definitely looked like she was in a lot of pain and was scared. It’s so sad. Poor girl. It’s hard being a female.