A friend of mine has a 26 gallon bow front tank and has several live bearers in it. She had a pair of Creamsicle Mollies in it and the female was very, very close to having babies. She's had them once before and acted the same way then. She was a relatively young fish.
She began getting overly aggressive when the other fish came near her and was finding a quiet place to hide. My friend thought she was ready and then all of the sudden, with no syptoms, she died. A few babies must have made it, but there were plenty that didn't.
I haven't seen the tank myself since a couple days before it happened but I told her I'd ask here what everyone thought. This was one of her favorite fish so she's a bit bummed. She has very little loss in her tank and her mollies in particular do really well. In the tank, she has about 6 Mollies of different kinds, a pair of male guppies, a pair of mickey mouse platy's and a couple of tetras. I believe that is all. I can't remember for sure. Oh, and a cory cat and otocinclus.
Any thoughts on why she died? Too many babies? Could one be stuck? I honestly haven't had a lot of live bearers, so I have no idea if that is possible.
Everything that gives birth has a risk of dying in childbirth. Babies get stuck, stuff gets torn and bleeding, other bad things happen when a mother is stressed and exhausted. Its very common and pretty impossible to prevent in fish, so your friend shouldn't blame herself.