Reddit reviews Puppy Intensive Care: A Breeder's Guide to Care of Newborn Puppies

I'll echo the suggestion to consider terminating the pregnancy and spaying your bitch, simply because there are probably a lot of mixed-breed shelter dogs who could be quite good companions for your friends (and allow them to get them on their own time - puppies aren't easy!)

If not - how have you determined she is pregnant? How far along do you believe she is? Have you talked to her vet about pregnancy/puppy care, by chance? Do you have money in case she has whelping problems? Dog breeding can be easy... as long as nothing goes wrong. When it doesn't go perfectly, it becomes an absolute mess.

I've not personally read them, but I've had these two books suggested as good resources for breeding/whelping.