
All that's been said is true-ish, but what your friend needs to do is make sure she goes to a good breeder.
Not all in a litter are high energy, they're not all workaholics, nor do they need to be on the go all the time. They can and do make fabulous pets. If you have an out of control collie and do tons of exercise, then you just end up with a very fit out of control collie. There are plenty of collies that fit quite happily into the very important role of household pet. Yes, they need exercise, most dogs do, don't they? But that doesn't mean you have to do 10 mile hikes with them every day, nor do you have to give them the equivalent of MENSA tests on a daily basis. What you do need to do it make sure you go to a good breeder, one who wants the utmost best for their dogs, knows their dogs and will match the puppy to the owner. By 6-8 weeks old it IS possible to very successfully match up pup to an owner's life style, but not if you go to a breeder who hasn't bothered to watch the development of the puppy, picking out the ones that will go off to do very good jobs (whatever they may be) and the ones who will fit in nicely to a family pet role, and yes some will happily be couch potatoes ... so long as you exercise them a couple of times a day (which surely must be a minimum requirement for any breed?).
I have always had BCs/working sheepdogs, and I cannot imagine having any other breed, despite there being some fabulous dogs out there. But they really do not have to be on the go all the time!
There are also some super rescue dogs out there, the problem with rescues is you do not always get the 'true' story from the rescue centre. An organisation like the Border Collie Trust do fully assess their dogs and place them where appropriate, although I do have some issues as to where they wont place them!
Just tell your friend to do her research, get in touch with a number of breeders and ask tons of questions of them and anyone in her area with a BC. There's nowt better than personal recommendation!