What is going through my Mom's head?

It boggles me that the woman who gave birth to me and raised me for 22 years has found it so simple to step out of my life.  Maybe simple isn't the word to use but in my eyes she did it like nothing.  How can someone go from being my best friend to not wanting anything to do with me?  I'm not a bad person!  As much as I want her to understand and accept me I know it's not going to happen over night but she's not even trying!  She refuses!  Due to her opinions being so voiced I have had no contact with my younger sister.  I'm sorry but talking about me to my sister is not the way to go.  If you need to talk to someone talk to an adult!  Heck join a support group for parents of bisexual children or do some research!  Anything!  My whole life I have lived my life how she has wanted me to and I've suffered because of it.  I've always felt there was something missing and have questioned my sexuality but it's something I could never talk to her about.  I am finally choosing how to live my life and she can't handle it.  I know parents are there to guide us but I feel like I've never had a say.  So, I'm very curious as to what is going through her head.  Does she miss me?  Does she want to try?  Will she learn to accept me for me?  Does she really want to lose me?  Does she feel she failed me as her daughter?  I don't know there are so many things going through my head.