A&A isn’t like other games. What your mom should really understand is this game requires critical thinking along the lines of resource allocation (cost/benefit analysis) and evaluation of short-term gains vs. long term goals. Your ability to understand complex written rules, convey their meaning to others (speech and debate), and apply those rules to your benefit, will improve.
In addition, the game requires teamwork, patience, imagination, and commitment.
And if none of that convinces her, tell her that you understand and respect her decision, and that you’re sure the video games you will play instead will probably better prepare you for collage anyway.