Crooked spine can mean several things, swim bladder infection, not disease, fish TB, vitamin deficiency, or tumor to name a few things.
Best natural treatment would be Epsom salt 1tsp/gal along with 100% daily water changes for 10 days, hold all food for 3 days then feed half feedings that have been soaked in a infant drop type vitamin about 1 drop, you are looking for A and B vitamins every other day. Cover the top of the container with a veggie wrap to hold the temp and humidity. If she is struggling to get to air-you may want to lower the water level some.
Wash you hands really good before and after you do anything with her, if it is TB it can be transferred to humans when you have open wound on your hands, this is very, very rare. If it is fish TB they usually do not survive.