I can't honestly say that having a mother who was deaf had any lasting effects on my life. I was born with my mother being deaf, and didn't know my life to be any other way.
I learned to speak slower and more clear to her so she could read my lips. I never had to learn sign-language, because my mom could speak clearly, and was a seasoned lip-reader. It was second nature to me to adjust my speed in speech with whomever I was conversing with.
I remember having to repeat myself a lot, and sometimes that could be frustrating; but, it was never an issue.
The biggest effect on me, in terms of my mom, was when she first got the cochlear implant, and was suddenly, amazingly, able to hear me on the phone. This changed everything. I think if her mechanical hearing were to fail her now, the adjustment back to having a deaf mother would be a difficult one.
This is from me, her mom ;-)...Ashley was in college when I received my implant...and she lived hundreds of miles away to attend the university; so, being able to communicate on the phone, for the first time in our lives, was a really big deal. All of my children were grown before I truly heard their voices -- for me, that was the biggest deal of all.