[Alin10123]

Hi,
I have a set of 3 lyretail mollies with one that's very pregnant. Her Belly just looked like it was about to explode and she wasn't eating at all and was very distant from the rest of the pack where she usually would swim with the other 2. I have read that this is a sign that she's about to have her fry. So i put her into the breeding net hoping that i'd have fry the next morning.
She didn't have fry that next morning nor did she still want to eat. So i decided to give her another day. 2 days has gone by since she's wanted to eat. But this morning when i got up, she was dead. Just dead at the bottom of the breeding net sideways with her two side fins sticking out like airplane wings. Not sure what happened. Is it possible for livebearers to die while in labor?
I have the temperature set at 79 degrees and i'm always careful to put the right amount of aq. salt in the tank when i change the water.

I haven't checked the water parameters yet since all of the other fish seem really fine and i had just changed the water last week.

I would appreciate any help on this.
thanks
Aaron