Betta Fish: Tina is a fat lard

I have a 55gal community tank. 6 neon tetra, 6 black neon tetra, 6 bloodfin tetra, 5 serpae tetra, 3 albuno corydora, 1 otocinclus, 2 female betta. All of my fish are healthy sized, except for one of the female betta: TINA. She was larger when I added her to the tank, but when feeding time comes, I have noticed her also eating the flakes for the tetra, and trying to eat the corydora sinking tabs, in addition to the betta pellets. They do get bloodworms a couple times a week (leftovers from feeding pea puffers housed in another tank). I was wondering if she may be egg bound? I also understand she may be obese. My other female betta (betty) is smaller, between health and overweight. Do i need to separate her when feeding the community, or is there something else going on?

[Pictures of fish are difficult to take]
(Sorry for the quality)