The guinea pig wasn't certified as a service animal? So I don't see how she can claim it. I would love to take my dog to church, work, anywhere, just because he makes me happy. But that isn't going to fly, because he isn't certified. Just because you can carry a card for medical marijuana, doesn't mean you can use it anywhere, I feel the same goes for an Rx for a companion animal.
I'm surprised she was awarded that, and more surprised that they even cared about her little fuzzball that wasn't causing anyone problems.