If you have females and males, all your females will be pregnant VERY soon. Sounds like you bought a very pregnant one already. I'd follow along with DwarfGourami's advice. Don't put her in a breeder net/trap, plant the tank up well, and if you want to save the fry, put them in the breeder net.
As for feeding, when they are young you can feed fry food, or very finely crushed flakes. If you do the flakes, it'd be best if you could suppliment them with some kind of high-protein food. You can get live BBS, or frozen. Or take some kind of Freeze-dried food and crush that up very tiny. As they get bigger, you can continue on with the flakes and supplimenting in the high-protein foods. Remembr, fry need to be fed at least 3 times a day. preferably 4-6.
However, are you prepared for these fry? What size tank do you have? Just the 10 gallon? And do you have a place for them when they grow up? You are aware that pregnant females can have anywhere from 10-100 fry
per month. If you multiply that by three....you'll have a lot of fry in a few months! It might benefit you to just raise a couple batches, then do survival of the fittest.
You could probably get a few more females in the 10 gallon, but I wouldn't do that. As DwarfGourami mentioned, when all the fry grow up, you'll quickly get stocked.