L.C.
If the cats are healthy, there's no reason to get rid of them, especially if your daughter feels they are part of her family.
My husband travels a lot for work and when I was pregnant I was worried about caring for our cat while he was gone because of the "litter box disease" or toxoplasmosis. My OB assured me that as long as I was careful scooping the poop and washed my hands thoroughly after there was no danger. He said a woman would almost have to rub her nose in the stuff to really be exposed. Just being around a cat is not dangerous as long as the cat is otherwise healthy, which it sounds like your daughter's cats are. And I know I'm not the only pregnant person who has spent nights curled up with a warm kitty.
I urge you to and your daughter to have a talk with her doctor about it and have your daughter screened for it as well for peace of mind. A lot of cats are given away because of unfounded fears of toxoplasmosis.
If it's just a matter of simplifying your daughter's life -- five cats is a lot -- that's another story. But with a minimum of caution, there is no need to give the cats away for fear of disease.