before you get into hot water, perhaps its time to stop in your HR dept. (human resource). You need to bring it up front with HR and say you are feeling harassed and uncomfortable. You need to make sure you comment clearly that you are extremely happy that she is making arrangements to work out the communication, however you are not sure why she is keeping copies and you dont have any for reference.
Many companies have a policy on harassment and this falls in the gray area of harassment. It doesnt necessarly have to be sexual comments, but anything to make you uncomfortable being handicapped, different race, comments or statement regarding to opposite gender, etc.
You need to make a case to HR saying she is keeping copies of conversation and won't let you have a copy and you feel harassed by this. Whatever HR comes up for a resolution, you need to follow it to the letter, or it will be grounds for termination for you, doesnt matter if you like it or not.
There is no clear cut law on this, but if you feel discriminated, it needs to be documented and have copies of that documentation. once you have copies, you follow company policy and always cross your T's and dot the I's, then you have a case.
It may not be what you want to hear- but you already know that being deaf means we have to work harder and better then hearing people in today's economy.