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Aquarium Advice Addict
courtesy of betta fish - bent spine - Straight Dope Message BoardBetta fry sometimes develop bent spines as they mature. It might be a genetic thing or possibly the result of poor water or food quality. There's usually not much you can do other than keep them in shallow water if they have trouble swimming, or cull them if they seem to be suffering.
If the betta is an adult who has never had this problem before, it might possibly be related to constipation. Sometimes they float or swim strangely when constipated. Is her tummy swollen? If so, try fasting for a few days or give her a small piece of pea. It could also be some sort of swim bladder infection, which will either make them float too much or too little and have trouble swimming.
I'm no expert, but I've owned quite a few bettas and those are my first thoughts.
I just found this from googling it. Could just be genetic. Was it like that when you got it?
Also, I did notice that your betta does appear to be bloated. Maybe you should try the pea thing, and see if it helps any.