How old is Daisy? If she's over 6 mos, then her immune system should be able to control any coccidia infections on its own. The incubation period is around 14 days (or so I've read) and Daisy *might* be susceptible because she was at the breeder's home. When we took Sophie to meet with my Daisy's breeder, she was sniffing around the kennel and she caught it too!
I felt REALLY bad about taking her with us to look at puppies - live and learn. I hated that I bought a sick puppy into our home and felt really guilty about it. It also took me a little longer to bond with Daisy because she was so sick with coccidia! But they are both perfectly healthy now!