Consult with a local landlord tenant lawyer to help with you in evicting the tenant. You may want to seek a refund from your broker.
If this answer is helpful, then please mark the helpful button. If this is the best answer, then please indicate it. Thanks. For further information you should see an attorney and discuss the matter completely. If you are in the New York City area, then you can reach me during normal business hours at 718 329 9500 or www.mynewyorkcitylawyer.com.
Who paid the Realtor, you or the tenant? Did you have an agreement with the Realtor? What does it say she is supposed to do? Did she breach that agreement (assuming you had one)? Not sure, based on what you've said . If the tenant paid the Realtor, you probably have no privity (realtor is not obligated to you).
What does your lease say about roommates and pets?
If they're paying the rent, not sure if you can get them out based on what you've said so far...
I may be guessing or not licensed in your state. No atty/client relationship exists. I earn my living collecting points for "helpful" answers.