How do I bring myself to stop worrying about my mom so much?

She's extremely vulnerable, never eating whenever she shares dinner, always let's everyone walks over her and constantly disrespects her. She's been married to a man that has belittled and criticized her food (even though she's an excellent cook) for decades. I just worry about her because she's not one to fight back and stand up for herself and I HATE to see her being disrespected. As a result, I am always in arguments with my older brother and father whenever they're being disrespectful. For this reason, I'm not on speaking terms with either of them.

I hate my household and country at large and I CAN'T WAIT for an opportunity to migrate but I just get overwhelmingly heartbroken whenever I think of leaving her behind.

I know I have a life to live and all but my mom has been through soooooo much darn abuse, both physically and verbally and I just have a soft spot for her.