Your only other chance to save the fry is to watch carefully and if you have another tank for the fry ready net them and place them there once they are born.
I was planning on moving the adult females to my ten gallon community when the fry are born, and keeping the fry in the five gallon. I have some male guppies in my ten gallon... my ten gallon isn't fully stocked currently... so there is room. However, if all else fails, I can use one of my big buckets and airstones as a back up plan.
If you have a petco or petsmart, they sell a couple different varietys there. At least mine do
But they have the little net that keeps the mother and babies away from all other fish in the tank. I want one that is like a whole seperate fish tank, I think its called "Penn plax aqua nursery"... anyway, it holds the mother, and when she has her babies, the babies swim through a small crack that only the babies can fit through, then they swim over and they are in their own separate little tank. That way it wouldn't matter to me when she has her babies, as long as they are safe.