She's always been there for me. I tell her everything about my life (not that I have much of a life to tell about anyway). I tell her my concerns; my worries; my dreams; my goals, etc.
She has been the biggest influence on my life. She's given me wisdom and she has taught me things about life.
To be honest, I feel like a lot of other people might respond with the same thing. Not mother-specific, but parent-specific. When you think about it, our parents have the biggest influence on our lives (a lot of the time); thus becoming the most important people in our lives. Though I guess it all just comes down to what kind of relationship you have with them.
Sorry for kinda derailing the topic there; I tend to go a little too far sometimes.