I edited my post with another picture.
I agree, they don't look the same.
I'm pretty sure bettas can develop eggs even without a male around.
From what I understand, they can expel them or the body just absorbs them.
This isn't from personal experience.
I'm not 100% sure but I don't think that dropsy always results in raised scales.
Drospy is when the fish retains fluid because of kindey/liver failure. You probably have already researched that.
I had always read and been advised that
freeze dried daphnia could help. I don't know why frozen should be any different.
This way she's also getting some of the protein she needs.
The only ways to know if she's pooing is
1) seeing her go (obviously)
2) Seeing waste in the bottom of the tank.
Bare bottom would be easier.
When I first had a constipated betta I was advised to use peas, but not too much because she's already constipated and too much food (peas or daphnia) in her belly would just make her more swollen.
It's worth a try to increase the fast time and lessen the amount of pea.
I hope if any of the above is wrong someone will correct me.
I know it's frustating
Wish I could help further.