We didn't ask how big she was. Very young females may not drop many fry. It is not entirely unusual for there to be a problem with the first drop. Despite your fine care, that may be a rocky time for the female. As Phry perceptively noted, next time will be better.

It is very wise to have a tank all to the expectant female, even if it's only a 5.5 gallon one (although the 10s often cost less). Today is the 9th of October. At the end of the month, maybe while waiting for trick or treaters, move her to her own tank. That gives her a week to get comfortable.

Even a big plastic sweater or storage box from K-Mart will do. Either cover it or put plants in it. If it is covered, punch a small hole in the middle of the top. Slide a piece of hard airline tubing in there - it will do the trick.

Make sure the maternity ward is not in a drafty place.

Even if she's in a conventional tank, drop a bunch of plants in with her. Feed her a fair amount of live or rinsed frozen foods.

If you really want to cover your bets, leave a few black worms in a clean (soapless) pickle jar. Those darn worms can climb almost anything except glass. (I was feeding some "baby sat" discus, had the worms in my hand and felt a twitch at my elbow...). This allows the female livebearer (or egg layer as a matter of fact) to recreationally forage for worms rather than fry.

I would like to second G.G.s warning about those breeder boxes being death traps. I learned that while killing my favorite female guppy (as a junior high kid.)

Also don't move females too close to term as they may prematurely drop. Sometimes everything works out, sometimes the fry may be hurt or some stillborn. It can even injure mom. I found that out when I was old enough to know better. :(