This isn't much help for the most serious part of this, but... Those red streaks in the fins aren't directly caused by the infection, blockage, disease, exposure, or whatever else might be ailing your fish. The streaks show where blood vessels have broken down and this comes from the extreme stress and exertion she's under as she constantly struggles to right herself all the time only to roll around again. A secondary issue, obviously, but that's not what needs your immediate attention. Fin tissue will break down too from stress, pain, anxiety. If you can correct the life-threatening condition (somehow), the blood streaks will go away by themselves... fins grow out again, too... on their own.
I can't help determine what the major problem is. But at this point, the distress alone that she's in because of it is enough to cause death. She needs relief fast.