She look very small you can see her bones and she always at the bottom of the fish bowl.. i had a pretty Red betta in the bowl with her but she still didn’t eat so i took her out of the bowl and put her in her own bowl!!!!!!!!!!!!!!!!!!! I think somethings wrong with my fish…
sounds like she has a swim bladder problem eg pseudomonas fluorescens and aeromonas hydrophila which cause the fish to lose control of buoyancy,causing severe stress and death swin bladder destroys bacteria it is added over 2 days to avoid shock to yr fish once u have done this she should eat and get well again hope this helps u out
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do you know your water chemistry? did you cycle the tank? how big is the tank/bowl? even though a lot of people don’t think so bettas need a filter, a heater and a tank of at least 5gals to be happy. do that and trust me she will change a whole lot. google “bettas fish” and get more info about them.