I sincerly think we are all on a journey when challeges face us in life. my sister and best friend was dx with advanced cancer in 2001. I closed down my business in order to have time to visit with her and support her emotionally..She was on the East coast and I am in the Midwest. I lost her in 2008. My Mother was dx' in Jan. 2010 and passed 4- 2010. Pulled my kids out of school and home schooled them so I could travel the 2 hours each way or stay over and be with my Mom.
Durning 2012 my favorite Auntie was dx'd with ALS I tried to visit her every single week for a year until she passed. These were all some of the best decisions I have ever made. I spent some of the best time with all of my loved ones and I value that time and those memories more than anything.
I think in this world nothing is more important than family. I think you should do everything possible to be near your Mother and help her. Character is about doing the right thing even when its hard.
I don't know your Mom's stage or her health situation but she has a chance to survive this because she is young. And you are young so any changes you make in your life- changing jobs or location where you live is not so dramatic. What would your Mother do if this were you?
I think you will be proud of yourself for taking this journey with your Mom and you will grow a great deal and the Universe seems to pay it forward. When one door seems to close many doors seem to open. don't be afraid to do the right thing because family, love and faith are the only things that matter and they are the things that endure.
Once you know of her treatment plan sit down with all of your family members and make a plan on the help that she needs and how you can be there for her. The decisions you make now will be with you forever. Follow your heart, trust your character and do the right thing.