First off, basic information. She's two years old and I have her in a 1.5 gal bowl with sand and artificial plants. There is no heater or filter and I have raised all of my bettas like this for years. Yesterday I cleaned out their bowls after having them dirty for quite a while. It was the longest I had their bowls dirty. There was algae in there before cleaning, but it was green, not brown. Whenever I clean their bowls I always add in aquarium salt and purifying drops.
This morning I woke up and noticed that my female was floating. (My male is fine, but his bowl wasn't as dirty prior to cleaning.) She's acting normal aside from floating, with the exception of her tail being crooked. She isn't floating on her side, but her top fin is sticking out of the water a bit. If she goes to swim down she floats back up. My guess is she got into shock, or some sort of bacterial infection from the sudden water change.