Communication woes

I know I said I wouldn't talk about A as much on here.  I made a promise to her that unless it was something that I needed to discuss, I would only mention her.  Lately though, I've been having a personal issue with her.

I am finding it hard to communicate with my 6 year old.  Yes, you read that correctly.  I know, it's probably a normal Mom thing, but for me it is absolutely breaking my heart.  See, A and I have always had a love/hate relationship.  Why?  Well, I honestly believe it's because she is so much like me.  She's very headstrong, independent, quiet, shy, nose always in a book and full of opinions.  Like me, she rarely expresses her opinions to people though, for fear of hurting the other persons feelings or causing a controversy.  Both of those traits are exactly like me!  Now, on the flip side of that coin, A has always had a strong relationship with Chuck because of those reasons. 

At the tender age of 6, A and I have had HUGE disagreements over topics (see the headstrong part above).  I mean screaming arguments (I'm not proud of this, but it is what it is).  I'm also sure that to some extent this is normal.  Especially when you have two strong personalities that are so similar.  Lately however, things have changed.  She doesn't talk to me like she used to.  She doesn't come running in the door after school breathless just to tell me how her day was.  Now, she just walks in, takes off her backpack and gives me her folder.  Then she trudges off to change out of her school clothes and starts her evening.  No more "Oh my goodness Mommy, guess what?"  or "I did the best thing today". 

Maybe I'm at fault for not asking more, I honestly don't know.  I'm not even sure where to start at this point.  It's become so routine for her NOT to talk to me.  Yet, I miss our talks.  So, what's a Mom to do?  Do you have any suggestions?  I'm wondering if it's just her age or a stage.  Either way, I'm at a loss.