We'll need more information here. What species is this fish? What size is the tank and how is it set up? Were you using breeder traps?
Always remember fish tend to die after giving birth if severely stressed and this is especially true when you place the gravid female in a breeder trap which does not offer refuge and comfort for her at all, but stress her to the point she will attempt to jump out of fright and die in the process due to severe stress.
Mollies are indeed very easy to breed along with guppies, platies, Endlers and swordtails. What did you do to the female to make her breed? Use a 5g densely planted tank for this case.
A fish is not really going to die unless severely stressed by facotrs especially a place where it cannot take refuge in times of labor hence I recommended a 5g tank which should also be densely-planted and ran by a sponge filter only.
I've seen livebearers drop fry every month for years without ill-health effects. As lupin said, just make sure you don't stress her out, and provided she's generally healthy, she'll be totally fine.
My female molly drops fry like clockwork every 6 weeks. This is her halfway between her last 2 drops that I chose to save. usually I don't save fry because I have little room for them. Those are a few of her fry in with her. I seldom separate them from my female but they don't survive when she is in the community tank. This time she was in the tank with just her fry.
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