Usually responding to your own thread will cause it to be missed.
Any way I would say that there's nothing you can do if its progressed this far. Sounds like either a bacterial or parasitical internal affliction.
I would just separate her from your healthy fish and let her pass in a separate container. I'm assuming you don't have another tank. Maybe a bucket or large bin filled with tank water. At least the fish would be in some type of comfort. I won't expect her to last more than a few more hours, especially if she can't resist the filter intake.
Try to keep an eye on your healthy fish. Watch for clamped fins, flashing, raised scales, discolored poop, frayed fins, white sand like spots, fuzzy white patches.
Most common cause of fish illness is bad water quality. Keep up with the PWC
's and monitor water parameters.
Also try to invest in a quarantine tank. Fish bought from stores are usually stressed and commonly carry infections. This can be easily introduced to your healthy fish when you bring them home. By having a quarantine allows you to monitor your new fish and be prepared to get them healthy.