I also have a hard time dealing with my mother. I know the theory pretty well, but I'm still not able to implement it with her. For me, it's the biggest challenge ever. But the theory behind it is firstly, love her as she is. Look at all the positive aspects of her. Is she caring? Is she a good cook? Would she do everything for you? Does she spend money for you without ever talking about it again? What do you still like about her?

"But I know with LOA if it is a relationship that isn't meant to be then it just isn't "
Where did you pick up this line? You can better every relationship and you can have every relationship exactly the way you want it to be. Everything else are just limiting beliefs. How do you want the relationship with your mother to be? Focus on that. Focus on how you wish to feel about her, visualise positive interactions with her. It's all about your focus. If you are able to ignore how she is now and focus on the version of her you want to experience, it will be your experience.

If it's your path of least resistance to walk away and you have the possibility to do it, then do it. I made that my strategy too. However, if you want it to change, you have to change your focus. If you can't find something good in her, make it up or remember things you used to like about her. You don't have to figure that out right now. You are only responsible for your own feelings. Do whatever feels good in the moment and maybe she sees how happy you are and learns by your example.