You could PM yorkietalk member alaskayorkie. I know his Eddie is a therapy dog, and there's a few others on here.
I'm pretty sure there's a few organizations (TDI?? I think is one them) that do the therapy dog test. I *believe* they first must receive their CGC (Canine Good Citizen) and then go on to get their TDI.
Good luck! I LOVE seeing others into training/etc with their Yorkies. They are so smart and have so much potential. Keep up the great work. I'm sure she will makes lots of people happy.