Yeah, I give a new mom two chances, after that, they're culled out. Generally speaking, new breeders, especially if you purchased them can be very nervous. If you plan on growing, do it with your own stock, and raise them together. They are social animals, and it really helps to keep a bunch of females together to raise them up.
Short of that, keep them well hydrated and use a quality rodent diet. Should they eat babies again, cull them out....
The higher the temperature, the lazier they become. Eventually, they will stop breeding and just lay around. But, that generally doesn't happen at the temps you mentioned. Anything above 82ish, I start up the fans and make sure they have plenty of air circulation. I usually run my A/C in my buildings when it gets above 80.
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