I think you can write a letter to this lady and put inside to another letter to the congregation where you ask to deliver your mail to her. I hope they are not dishonest to this level. I think like this you should be able to reach her.
Than as content maybe you can ask for her answer to the ARC and IICSA, as in the JW.Org you didn't find any answer in the legal area. In a plain and gentle way as you are interested truly.
Than in case you want to avoid your real name and want to continue the discussion, you can build anonymous email for it to mention inside.
Good luck and keep us posted if you will reply
IC