Gaye is right (as she so many times is!) This cat does not deserve to be hated, because she can't understand what is expected of her with these kittens. IF the kittens are sick, the mom will shun all of them. She will also try to dispose of them in every conceivable way because she knows they will not survive. Your friends sounds to me like she is angry that this cat has inconvienenced her and now she has to care for kittens, do bottle feedings every two hours, stimulate bums and make sure the kittens are cared for- when all she wanted was the joy of having kittens with an attentive momcat, and it didn't work out that way.
Well you know what? Sometimes, this "joy" of wanting kittens backfires. The momcat dies, the kittens die, the owner gets frazzled, vet bills pile up, and things can and do go wrong. Your friend should have spayed her cat. If she is going to be mad at the cat for a situation that SHE the owner created, then she should own goldfish.
I hope her anger does not translate over to her losing her temper and hurting the momcat.