The news article doesn't give us enough information. First, there is the discrepancy about when the owner came into possession of the monkey. (I can't remember if the article even specified what type of monkey it is). Animal Control says they have documentation proving the owner got the monkey after the recent change in law. What is this documentation? The owner says she got the monkey before it became illegal to own it. Where is her proof?
Second, why did the person she consulted with about a solid food diet turn her in? Who is the owner's vet, and what does he/she have to say about the animal's condition? What does the zoo vet, where the monkey is now, have to say?
Finally, how is the monkey adjusting from being a pet, cared for by a private owner, to being in a zoo situation? My personal opinion is that the owner should be allowed visitation until the matter is settled. Whilst not knowledgeable about non-human primates, I would imagine they would form strong bonds with their caregivers, and not being allowed to see the owner, whilst at the same time being in a different place, must be stressful. JMHO.