Hi Ciram,
This is my first post here so I hope I don't mess things up too much. I am sure there are many theories as to what your Mother might be going through, but without knowing her we don't know things about her past which most likely have affected her future. We only know what we know, so she was only able to teach you what she knew, hopefully to the best of her abilities. But now, life is your responsibility.
It is wonderful that you are trying to keep a connection with her. She is your mother and you feel for her. As you unravel yourself with Psychology, are you finding things that would probably "fit" her too? I know I have with my Mother. We learned long ago to keep a distant relationship. Don't get me wrong. She raised me to the best of her ability, gave me all she knew, but she only knew how to have "distant" relationships. I learned that from her, and it kept me distant from people for almost 32 years. After a very emotionally difficult divorce, I have started to learn what it means to have a relationship. Sure, I could have gone through life as I was and been content. I was well on my way. Life was good, life was content. But, after being smacked in the face, a wake-up call if you will, I have changed. Another poster mentioned about not changing, people should like you for who you are... but what if you have poor relational habits? Most of the time we have destructive habits built into us but never know it. Again, we only know what we know and we usually think that way is the only way - because it works for us. What if there is better? Why does my friend Todd offset bolts on his porch railings? It looks better to me with them in a straight line, and I've been doing it that way for years... He does it because the railings won't twist from side to side, like they do when I do it my way... He's learned a different, better way.
What I'm getting at here is my experience with what I think is a similar situation to yours. My Mother and I aren't close. She loves me, and I love her, but we are not close in a way that I feel we should be. I didn't know how to do that because she, nor my father, never taught me how and I never knew to go out to learn how. Now I know how to look. I am learning how to close that gap. I am changing because it is for the better. Change can be good, change can be wonderful. I am very pro-change. But, a person has to want to change, no one can make them change. That is the learned rule and one I've learned quite well with much frustration. There is a trick though.
Change yourself. You've said you're growing and learning. That is great! Sure you mother is having a reaction to your change... I almost wonder if it is jealousy in a sense. I wonder if she sees where you are going and wants to follow, but feel stuck. I suggest to keep doing what you are doing. Keep sharing things with your mother, but feel out her comfort zone. Talk with her as much as you can through the process. There will most likely be difficult times because we carry many deeply entrenched habits that are hard to break. "Old habits die hard", even if they are ones we are aware of. As you grow, you will learn better ways to communicate with your mother. Each failure is an experience, each experience is a lesson and is learned. You will learn your mother and how to talk to her, but there will be failures at the time. I tried speaking direct to my Mother when I first started all of this, and she threw up the defenses. She used guilt, deflecting, and a whole other mess of things that mothers seem to excel at. But I've learned. I tell stories to her about "friends" of mine who have certain difficulties. Basically, I talk about an issue between her and myself and just change the names. She listens intently. As I talk of the new things I learn, she gets more intrigued.
Someone told me once, when you start to grow and take off, people who love you and want to be a part of your life will follow. Sure, they may protest because moving would cause them to leave a comfort zone, but eventually they will come. It may even mean to leave them behind for the time being. Take that time to do all you can to learn so you are there for her when she is ready. Because you can't make her go, she has to want to go. Just keep showing her you care and want to be a part of her life, but don't stop living yours.
My advice, keep going forward, don't fall back. You will do her good one day by helping pull her forward, helping pull her out of her rut. Old dogs can learn new tricks. This old dog has had first hand experience.