Guppy birth cause of death?

So i had this once before. Close to the gravit spot where the fry gets out, it swollen andcan see the female is stressed and swims weird. So i want to confirm that if anyone had this before?
There was no problem with her just as she popped a few fry thats when it started. Normal birth in the tank, i do not use nets or put them in another tank, shes in the main tank with the rest of the guppies.

 

i also heard before this happens often with female guppies when they give birth

 

It has happen to my guppies as well.
Wrote it off to birth complications

 

Some strains seem to be more prone to this than others. I got rid of 2 of my ATFG strains because of the females always dying giving birth. (Full Red and White Tuxedo.) Their tanks are now used for Halfmoon Bettas. My other ATFG and local strains are doing just fine.

 

Good to know, she was between 1 - 2 years old but had lots of fry. She was a large stunning female. Sad to loose fish like this,At the last birth i would say none less than 10 fry so i hope some of the fry females will look like she did