THe female is preggo again.; Get the male out now. They should be on either alfalfa pellets or alfalfa hay. The mom can have it until she's had her second litter and is done nursing.
Do you have a
cavy savy vet on call? Its very likely the stress of a back to back litter can kill your girl.
She should be getting a variety of veggies. Check out the nutrrion chart sticky for ideas on what to feed.
Only one male can be housed with females or there will be fight. If you only have one male, nueter it. SPaying is not suggested as its very invasive and risky. Best of luck to you.