Dear Bhikkhuni, I can understand why you may want to find an Arahat, but I don't think you will.
Not because I think there aren't any, but because I believe that an Arahat is not likely to declare that they are an Arahat. Not all the Arahats will teach either, the same as all the Buddhas didn't teach. Some Arahats don't want any contact with the world. Most of us can only ponder if someone is an Arahat or not.
My meditation teacher says that he would never tell one of his students that they have achieved the stage of Sotapanna as this would be the end of their practice. I think the similar thing would happen if a student is told that their teacher is an Arahat. He also says: "What use is for us knowing if someone is an Arahat?" meaning that only an Arahat benefits from being the Arahat, but we don't. We are wherever we are with our own development.
Some of the highly skilled teachers will not even teach a particular Dhamma subject if they think the student is not ready to understand it.
However, I think that you should continue to search for a good teacher. There will be more of those who are skilled Dhamma teachers (skilled in teaching the Suttas, giving good Dhamma talks...) and not so many who are also highly skilled meditation teachers, as teaching meditation is much more difficult and requires huge amount of different kind of knowledge and experience. I also believe that the relationship between the teacher and the student is very special and hard to describe. If you have had good and loving relationship with your parents, and if they were the most important people as you were growing up, when you find the right teacher, you may start to feel as if you have found a new set of parents.
May you find the best possible teacher.