I think we need a guide specifically for talking about what to expect when raising a female betta. This "suddenly fat" thing hit us out of the blue and kind of scared me, considering what I went through with my male that didn't make it.
The only references I ever see to anyone having a female betta is only instructions for how to breed them. There's not really anything about people having females who aren't breeding them.
It would be nice if we could know to expect the female to get fat like this sometimes.
How often do they go through this?