How much am I supposed to "save" my mom?

I genuinely need some perspective on this. I can, with surety say that I have been triangulated into my parents marriage. I have become completely aware of it just 3 months ago but i would say that i've known for probably a few years now. I love my parents, they love each other. And like any other conventional marriage, with members following conventional roles, there is bound to be some dissatisfaction. My mother coming from a difficult childhood has done an incredible job at bring us kids up. Full on sacrificing and all that. Maybe it comes from her childhood, but she has a sort of 'victim mentality'. That she can do nothing to help the situation. I never really used to see it this way. I have always really seen her as a genuine victim of circumstances beyond her control. And therefore I have always taken her side, abided by all her promises of girls shouldn't do this or shouldnt talk like that, etc. But lately, and this is very recent, while i've been listening to her crying , and talking about all the times she sacrificed to maintain the stability of the household, I've started to think " woman, you had plenty of chances." She genuinely did. While my dad is the kind that who will just put his foot down sometimes, he his not a terrible person. He is quite okay too. And if I think that maybe women of the past generation were just oppressed, then that is also wrong cuz, my mothers peers, sisters, they are all working women. They have their hobbies, their silly expenses, their favorite things. So how come my mother not have all that.

So now that i'm an adult, a woman at that, a modern one (?) shall we say, I feel that it is my "duty" to save my mother. To help her. Empower her. And i've tried. I enrolled her in a course she wanted, she did not complete that, in the past few years whatever extracurricular activities she has done, it is mostly because (not taking credit, just saying) i pushed her for those.

So i've done these things, i listen to her problems, i counsel her, but i am conflicted. I am at the peak of my youth. And i feel that i am not allowed to enjoy it until my mother is happy. But nothing I do works! and nothing i say, she does!

My question is, does simply walking away from this problem make me the worst daughter? Because i see these daughters online that help their mothers set up a business or something. It makes it sound like I just want to run away from this situation, But I just want it to end, like have a conclusion.

Do i just walk away since my mom has had the internet and enough pep talks, or am i not doing enough? And if there is something i should be doing, please tell me.