My Dad and I met her went we hunted last year in Ireland. She was riding with the same stable that we had chosen, so we did quite a bit of chatting with her over the week. (If the woman you know is looking at one of her Irish imports, I'm jealous.) She seems to have a number of students who event, so you might have luck asking about her on the eventing board as well.
I've known Terry for years and commend her to you as a person and as a horse dealer. She has imported some nice Irish horses for eventing, for her own riding and for sale. Here's the website for her farm: www.oakdalehorsefarm.com/
Terry has been a long time member of Commonwealth Dressage and Combined Training Assn. I just saw her at The Event at Kelly's Ford this weekend. I have never bought or sold a horse from her, but I also have never heard anything negative about her business. She is very pleasant and knowledgable. She's been in the business for a long time. I don't think she would do anything that would compromise her good reputation.