Do you know how old she is?
Also just to be safe I would see if you can separate her from the others (if it's not too stressful for her).
Other than that I'm not sure what I can do. She doesn't appear to be bloated or anything so I'm not sure...
it's been the same temperature 22 degrees Celsius, I also used a stress coat that removes toxins from tap water and ammoniaDo you know of any temperature changes or anything that could have possibly caused her stress, by the sound of it it sounds like she is undergoing extreme stress.
he a male goldfish and chases around a lot of the females but i wasn't sure if he was the reason whyOkay so in you previous post "Goldfish" you mentioned that one of the fish was getting bullied and hiding I believe. Could this be the same fish, do you have a dominant fish in you tank? That could be a reason for the stress.