Guppy baby questions?

I got a ten gallon tank with about 30 Guppies today. One is having babies right now but the other fish are eating them so I put it in a plastic shoebox with about a gallon of water and a spawning mop I made out of fleece and a rock but the mom is getting very stressed out and stoped having babies. Will she calm down or should I put her back in the tank with the other fish. Also will the babies be ok without a heater tonight? Thanks